County of Douglas v. Nebraska Tax Equal. & Rev. Comm. , 296 Neb. 501 ( 2017 )


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    COUNTY OF DOUGLAS v. NEBRASKA TAX EQUAL. & REV. COMM.
    Cite as 
    296 Neb. 501
    County of Douglas, appellant, v.
    Nebraska Tax Equalization and
    R eview Commission, appellee.
    ___ N.W.2d ___
    Filed April 27, 2017.    No. S-16-548.
    1.	 Taxation: Appeal and Error. Under Neb. Rev. Stat. § 77-5019(5) (Cum.
    Supp. 2016), appellate review of a decision by the Tax Equalization and
    Review Commission on a petition for review is conducted for error on
    the record of the commission.
    2.	 Judgments: Appeal and Error. When reviewing a judgment for errors
    appearing on the record, the inquiry is whether the decision conforms
    to the law, is supported by competent evidence, and is neither arbitrary,
    capricious, nor unreasonable.
    3.	 Administrative Law: Judgments: Evidence: Words and Phrases.
    An agency decision is supported by competent evidence, sufficient
    evidence, or substantial evidence if the agency could reasonably have
    found the facts as it did on the basis of the testimony and exhibits con-
    tained in the record before it.
    4.	 Administrative Law: Judgments: Words and Phrases. Agency action
    is arbitrary, capricious, and unreasonable if it is taken in disregard of the
    facts or circumstances of the case, without some basis which would lead
    a reasonable and honest person to the same conclusion. Agency action
    taken in disregard of the agency’s own substantive rules is also arbitrary
    and capricious.
    5.	 Appeal and Error. When reviewing cases for error appearing on the
    record, an appellate court reviews questions of law de novo.
    6.	 Pleadings: Judgments: Appeal and Error. A trial court’s decision
    to grant or deny a motion to reconsider is reviewed for an abuse
    of discretion.
    7.	 Pleadings: Judgments: Motions to Vacate: Appeal and Error. The
    abuse of discretion standard applies to an appellate court’s review of a
    trial court’s grant or denial of a motion to vacate or amend a judgment.
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    COUNTY OF DOUGLAS v. NEBRASKA TAX EQUAL. & REV. COMM.
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    8.	 Judgments: Words and Phrases. An abuse of discretion occurs when a
    trial court’s decision is based upon reasons that are untenable or unrea-
    sonable or if its action is clearly against justice or conscience, reason,
    and evidence.
    9.	 Administrative Law: Judgments. An administrative agency that is
    authorized to exercise quasi-judicial power is impliedly authorized to
    reconsider its own decisions.
    Appeal from the Tax Equalization and Review Commission.
    Affirmed in part, and in part reversed.
    Shakil A. Malik, Deputy Douglas County Attorney, for
    appellant.
    Douglas J. Peterson, Attorney General, and L. Jay Bartel
    for appellee.
    H eavican, C.J., Wright, Cassel, Stacy, K elch, and
    Funke, JJ.
    Wright, J.
    I. NATURE OF CASE
    The Tax Equalization and Review Commission (TERC)
    issued an order to Douglas County to show cause why TERC
    should not order the adjustment of the valuation of three sub-
    classes of residential real property in Douglas County. After a
    show cause hearing at which Douglas County appeared, TERC
    ordered the proposed adjustments. Douglas County filed a
    motion to reconsider, which TERC overruled. Douglas County
    petitioned for review with the Nebraska Court of Appeals. It
    subsequently filed a petition to bypass, which we granted. We
    affirm in part, and in part reverse.
    II. BACKGROUND
    In April 2016, TERC held its statewide equalization hear-
    ing. The State of Nebraska’s Property Tax Administrator
    (PTA) (the head of the property assessment division of the
    Nebraska Department of Revenue1) submitted reports for each
    1
    Neb. Rev. Stat. § 77-701(1) (Cum. Supp. 2016).
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    county to TERC. As required by Neb. Rev. Stat. § 77-5027
    (Cum. Supp. 2016), the reports analyzed the level and quality
    of assessment of the classes and subclasses of real property
    within each Nebraska county and made nonbinding equaliza-
    tion recommendations.
    The report for Douglas County analyzed residential real
    property by dividing it into six valuation area subclasses
    (areas) based on geography and other common features of
    each area. The report analyzed the assessment-to-sales ratios
    within these areas. The assessment-to-sales ratio is the ratio of
    assessed value to sales price, calculated for every property sold
    in an arm’s-length transaction. These ratios are based on the
    sales in the state “sales file.”2 The assessment of each class and
    subclass of most kinds of real property is required by statute to
    fall within 92 to 100 percent of actual value, as measured by
    an indicator of “central tendency,” such as the median, mean
    (average), or weighted mean ratio.3
    Three of the areas in Douglas County had median
    assessment-to-sales ratios outside the statutory range: “Area
    ­
    2” had a median of 104.82 percent, “Area 3” had a median
    of 89.77 percent, and “Area 4” had a median of 90.08 per-
    cent. The overall median ratio for residential real property in
    Douglas County was 92 percent.
    The report recommended increasing the valuation of Areas 3
    and 4 by 7 percent. It reached this conclusion on the basis of a
    variety of statistics that showed that the true level of value for
    both areas was 90 percent of market value, which is below the
    statutory range.
    The report also recommended that no change be made for
    Area 2 because “[t]he quality statistics . . . suggest [that] val-
    ues are not uniform and widely vary from the median ratio.”
    The statistics in the PTA’s report indicated that there was a
    high level of dispersion and lack of uniformity in the ratios in
    2
    Neb. Rev. Stat. § 77-1327(3) (Cum. Supp. 2016).
    3
    Neb. Rev. Stat. § 77-5023 (Reissue 2009).
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    Area 2. There was a lack of uniformity between higher- and
    lower-value properties in the area. The higher-value prop-
    erties were underassessed, and the lower-value properties
    were overassessed.
    The report indicated that the statistics for Area 2, such as
    the median, were skewed by a significant number of low-value
    sales. The median for Area 2 was 104.82 percent. But excluding
    sales of properties under $15,000, the median ratio of Area 2
    was 100.45 percent; excluding sales under $30,000, the median
    ratio was 96.21 percent. The report concluded, “Considering
    the ratio study statistics for the strata of sales above $30,000[,]
    the valuations [of Area 2] are considered acceptable.”
    TERC issued an order to show cause why it should not
    increase the valuation of Areas 3 and 4 by 7 percent and
    decrease that of Area 2 by 8 percent. At the show cause hear-
    ing, Chief Field Deputy Jack Baines of the Douglas County
    assessor’s office testified that there was a low-average sales
    price in Area 2, which, when combined with a small number
    of higher-price sales, tended to skew the data and skew the
    median ratio. He explained that with lower value proper-
    ties, smaller differences between the assessed value and sales
    price would cause a greater difference in the assessment-to-
    sales ratio.
    As to Areas 3 and 4, Baines believed that the data underly-
    ing the statistics in the PTA’s report was unreliable and that no
    changes should be made. Baines was new to his position. He
    testified that some of the assessment practices and procedures
    that he observed upon his arrival, such as not validating sales
    for the state sales file to make sure they qualified as arm’s-
    length transactions, rendered the sales file data unreliable.
    Because he believed the sales file data was unreliable, he con-
    cluded that the statistics calculated from that data were unreli-
    able. He argued that under generally accepted mass appraisal
    techniques, no changes should be made, because the data was
    unreliable. Baines stated that the correct course would be to
    correct the appraisal model and reappraise properties going
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    forward without making any blanket equalization adjustment.
    Baines’ testimony and the details of the PTA’s report are dis-
    cussed in more detail in our analysis.
    The PTA was asked whether any of Baines’ testimony
    affected her recommendations. She stood by her recommenda-
    tions as contained within the report to increase the valuation
    of Areas 3 and 4 by 7 percent and that no change be made for
    Area 2. TERC voted to increase the valuation of Areas 3 and 4
    by 7 percent and decrease that of Area 2 by 8 percent.
    Prior to the issuance of TERC’s written order, Douglas
    County filed a motion to reconsider and offered as additional
    evidence an affidavit from Baines. The motion and affidavit
    explained that Douglas County had compared the sales data
    submitted to the state by the county in its annual “Assessed
    Value Update” (AVU). The county discovered that many of the
    sales that it categorized as nonusable non-arm’s-length transac-
    tions in the AVU were included in the data for the PTA’s report.
    But the state had not given the county notice that it disagreed
    with the county’s categorization of those sales, as required in
    regulation. The motion requested that TERC grant a hearing
    and reconsider and vacate its prior order.
    The TERC commissioners voted 2 to 1 to deny the motion to
    reconsider and on the same day issued a written order adjust-
    ing the valuation as it had voted to do at the hearing. Douglas
    County appeals TERC’s order and the denial of its motion to
    reconsider. We granted Douglas County’s petition to bypass the
    Court of Appeals and moved this case to our docket.
    III. ASSIGNMENTS OF ERROR
    Douglas County claims that TERC’s decision to decrease the
    valuation of Area 2 and increase the valuation of Areas 3 and
    4 failed to conform with the law, was unsupported by compe-
    tent evidence, and was arbitrary, capricious, and unreasonable.
    It also claims that TERC’s denial of its motion to reconsider
    was arbitrary, capricious, and unreasonable and constituted an
    abuse of discretion.
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    IV. STANDARD OF REVIEW
    [1-5] Under Neb. Rev. Stat. § 77-5019(5) (Cum. Supp.
    2016), appellate review of a decision by TERC on a petition
    for review is conducted for “error on the record of [TERC].”
    When reviewing a judgment for errors appearing on the record,
    the inquiry is whether the decision conforms to the law, is
    supported by competent evidence, and is neither arbitrary,
    capricious, nor unreasonable.4 An agency decision is supported
    by “‘competent evidence,’” “‘sufficient evidence,’” or “‘sub-
    stantial evidence’” if the agency could reasonably have found
    the facts as it did on the basis of the testimony and exhibits
    contained in the record before it.5 Agency action is arbitrary,
    capricious, and unreasonable if it is taken in disregard of the
    facts or circumstances of the case, without some basis which
    would lead a reasonable and honest person to the same con-
    clusion.6 Agency action taken in disregard of the agency’s
    own substantive rules is also arbitrary and capricious.7 When
    reviewing cases for error appearing on the record, an appellate
    court reviews questions of law de novo.8
    V. ANALYSIS
    1. Principles and Explanation of
    Equalization, M ass A ppraisal,
    and State Sales File
    Before reviewing TERC’s order decreasing the valuation of
    Area 2 and increasing the valuation of Areas 3 and 4 and its
    denial of Douglas County’s motion to reconsider, it is neces-
    sary to review the background principles and the legal frame-
    work of equalization, mass appraisal, and the state sales file.
    4
    County of Douglas v. Nebraska Tax Equal. & Rev. Comm., 
    262 Neb. 578
    ,
    
    635 N.W.2d 413
    (2001).
    5
    Douglas County v. Archie, 
    295 Neb. 674
    , 689-90, 
    891 N.W.2d 93
    , 104-05
    (2017).
    6
    Douglas County v. Archie, supra note 5.
    7
    Id.
    8
    See 
    id. - 507
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    COUNTY OF DOUGLAS v. NEBRASKA TAX EQUAL. & REV. COMM.
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    (a) Equalization and
    Mass Appraisal
    The Nebraska Constitution mandates that “[t]axes shall be
    levied by valuation uniformly and proportionately upon all real
    property . . . .”9 To effectuate this mandate, the Constitution
    establishes TERC, granting it the “power to review and equal-
    ize assessments of property for taxation within the state.”10
    TERC is required by statute to “annually equalize the
    assessed value . . . of all real property as submitted by the
    county assessors on the abstracts of assessments.”11 In the
    exercise of this duty, TERC is granted “the power to increase
    or decrease the value of a class or subclass of real property in
    any county . . . so that all classes or subclasses of real property
    in all counties fall within an acceptable range.”12
    To assist TERC in its equalization responsibilities, the PTA
    is mandated by statute to prepare “reports and opinions” for
    each county; these reports must “contain statistical and nar-
    rative reports informing [TERC] of the level of value and the
    quality of assessment of the classes and subclasses of real
    property within the county” and may include nonbinding equal-
    ization recommendations.13
    TERC may equalize classes and subclasses of real prop-
    erty to ensure that they are within an “acceptable range”; an
    acceptable range of property valuation is defined in statute
    as “the percentage of variation from a standard for valua-
    tion as measured by an established indicator of central tend­
    ency of assessment.”14 For residential property, the acceptable
    range of assessed valuation is 92 to 100 percent of actual
    value. Whether a class or subclass of property falls within an
    9
    Neb. Const. art. VIII, § 1.
    10
    Neb. Const. art. IV, § 28.
    11
    Neb. Rev. Stat. § 77-5022 (Cum. Supp. 2016).
    12
    § 77-5023(1).
    13
    § 77-5027(3).
    14
    § 77-5023(2).
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    “­acceptable range” is to be determined by TERC “to a reason-
    able degree of certainty relying upon generally accepted mass
    appraisal techniques.”15 Generally accepted mass appraisal tech-
    niques include the standards promulgated by the International
    Association of Assessing Officers (IAAO).16
    Whether a class or subclass of real property is within an
    acceptable range is measured by an “Established Indicator of
    Central Tendency.”17 An indicator of central tendency is “[t]he
    result of measuring the tendency of most kinds of data to clus-
    ter around some typical or central value . . . includ[ing] the
    mean, median, and mode.”18 An established indicator of central
    tendency of assessment is one that is “utilized in generally
    accepted professional mass appraisal techniques.”19 Under both
    TERC’s regulations and the IAAO standards, the preferred
    indicator of central tendency is the median.20 Thus, TERC pre-
    fers that valuation data “‘cluster’” around the median.21
    When studying whether a class or subclass of real property
    is within the acceptable range of assessed to actual value,
    actual value (i.e., market value) is often determined by look-
    ing to sales data. A “[s]ales ratio study” is one that uses sales
    data as a proxy for determining market value.22 The PTA’s
    reports use sales ratio studies to determine the value of resi-
    dential property.23
    15
    § 77-5023(5).
    16
    442 Neb. Admin. Code, ch. 2, § 001.45 (2011).
    17
    
    Id., ch. 9,
    § 002.08 (2011).
    18
    
    Id., § 002.10.
    19
    
    Id., § 002.08.
    20
    
    Id., § 004
    (2011); International Association of Assessing Officers, Standard
    on Ratio Studies (2013).
    21
    County of Franklin v. Tax Equal. & Rev. Comm., ante p. 193, 195, ___
    N.W.2d ___, ___ (2017). Accord 442 Neb. Admin. Code, ch. 9, §§ 002.10
    and 004; Standard on Ratio Studies, supra note 20.
    22
    442 Neb. Admin. Code, ch. 9, § 002.19 (2011).
    23
    § 77-1327(3).
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    A primary tool for measuring the ratio of assessment to
    actual value is the assessment-to-sales ratio.24 This ratio is
    calculated by dividing a parcel of property’s assessed value by
    the sales price of that parcel of property. For example, a house
    with an assessed value of $95,000 that sells for $100,000 would
    have an assessment-to-sales ratio of 95 percent. Conversely, a
    house with an assessed value of $100,000 that sells for $95,000
    would have an assessment-to-sales ratio of 105.26 percent.
    Thus, using this ratio and using the median as the indicator of
    central tendency for a class or subclass of property, the median
    assessment-to-sales ratio would need to fall between 92 and
    100 percent to be within the acceptable range.
    The usefulness and accuracy of measures of “central tend­
    ency” such as median and mean depend on the “quality”
    or “reliability” of the assessments.25 Various tools are also
    used under professionally accepted mass appraisal methods
    to review the reliability of the measurements of central tend­
    ency.26 The IAAO Standard on Ratio Studies27 explains the
    importance of quality statistics:
    The calculated measures of central tendency are point
    estimates and provide only an indication, not proof, of
    whether the level meets the appropriate goal. Confidence
    intervals and statistical tests should be used to determine
    whether the appraisal level differs from the established
    goal in a particular instance.
    A decision by an oversight agency to take some action
    (direct equalization, indirect equalization, reappraisal) can
    have profound consequences for taxpayers, taxing juris-
    dictions, and other affected parties. This decision should
    not be made without a high degree of certainty that the
    action is warranted.
    24
    442 Neb. Admin. Code, ch. 9, § 002.02 (2011).
    25
    See Standard on Ratio Studies, supra note 20 at 33-34.
    26
    442 Neb. Admin. Code, ch. 9, § 002.17 (2011).
    27
    Standard on Ratio Studies, supra note 20 at 33.
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    The “Coefficient of Dispersion” (COD) is used to measure
    the uniformity of assessments.28 The COD is the average dif-
    ference between each assessment-to-sales ratio and the median
    assessment-to-sales ratio. To illustrate: Imagine a dataset with
    three ratios, 50, 100, and 110 percent. The median ratio would
    be 100 percent. The respective absolute differences between
    the ratios and the median ratio (100 percent) would be 50,
    0, and 10 percent. These ratios would average to produce a
    COD of 20 percent. A lower COD indicates a higher level of
    uniform­ity of assessment-to-sales ratios, while a higher COD
    indicates less uniformity. Under TERC regulations and the
    IAAO standards, the acceptable range of COD for residential
    property is 15 percent or less29; that is, the ratios must be, on
    average, within 15 percent of the median ratio.
    The “Price Related Differential” (PRD) is a measure used
    “to determine whether properties of differing values are treated
    uniformly.”30 PRD is calculated by dividing the mean ratio by
    the weighted mean ratio.31 Too high or low of a PRD indicates
    “vertical inequity,” either regressivity (underassessed high-
    value properties and overassessed low-value properties) or
    progressivity (overassessed high-value properties and under­
    assessed low-value properties). A PRD of under 1 indicates
    progressivity, while a PRD of over 1 indicates regressivity.32
    Vertical inequities of the regressive or progressive variety
    are to be avoided.33 Under TERC regulations and the IAAO
    28
    442 Neb. Admin. Code, ch. 9, § 002.04 (2011).
    29
    
    Id., § 005.02
    (2011); Standard on Ratio Studies, supra note 20 (5 to 15
    percent).
    30
    442 Neb. Admin. Code, ch. 9, § 002.15 (2011).
    31
    Standard on Ratio Studies, supra note 20 (explaining that weighted mean
    is calculated by dividing total assessed value of all selling properties by
    total sales value of all selling properties, resulting in ratio that is weighted
    for relative value of properties). See, also, 350 Neb. Admin. Code, ch. 17,
    § 002.19 (2013).
    32
    
    Id. 33 Standard
    on Ratio Studies, supra note 20.
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    standards, the acceptable range for PRD is 0.98 to 1.03 (98
    to 103 percent).34 Under the IAAO standards, “[u]nacceptable
    vertical inequities should be addressed through reappraisal or
    other corrective actions,”35 rather than through blanket equal-
    ization changes.
    The “confidence interval” measures the precision of the
    sampling process, while the “confidence level” is the “degree
    of probability associated with a statistical test or confidence
    interval.”36 The confidence interval measures how reliably
    the sold properties represent all of the other properties in the
    class or subclass.37 Generally, a larger sample size and greater
    uniformity of ratios result in a narrower confidence interval.38
    A narrower range of confidence interval indicates a greater
    reliability of a statistical measure (e.g., the median).39 For
    example, Area 3 had a 95-percent median confidence interval
    of 89.43 to 90.28 percent, meaning that the true median is
    95-percent likely to fall within that range. Under the IAAO
    standards, if any part of the confidence interval overlaps
    with the acceptable range, equalization is not appropriate.40
    The PTA’s reports are required by regulation to include a
    95-percent confidence interval for each of the measures of
    central tendency.41
    (b) Sales File
    The “sales file” is “a data base of sales of real prop-
    erty, including arm’s length transactions, in the State of
    34
    442 Neb. Admin. Code, ch. 9, § 005.03 (2011); Standard on Ratio Studies,
    supra note 20.
    35
    Standard on Ratio Studies, supra note 20 at 15.
    36
    442 Neb. Admin. Code, ch. 9, §§ 002.06 and 002.07 (2011).
    37
    Standard on Ratio Studies, supra note 20.
    38
    
    Id. 39 Id.
    40
    
    Id. 41 350
    Neb. Admin. Code, ch. 17, § 004.01C(2)(k) (2013).
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    Nebraska” and is developed and maintained by the state PTA.42
    All sales in the sales file are deemed to be “arm’s length”
    transactions unless determined otherwise.43 The sales file data
    is used by the PTA as the basis for her annual assessment
    ratio reports.44
    Nearly every real estate transaction in Nebraska requires the
    filing of a real estate transfer statement with a county register
    of deeds.45 These statements require certain information about
    the transaction and conveyance, such as the amount of consid-
    eration paid.46 The statements must be sent by the register of
    deeds to the county assessor.47
    The county assessors must provide supplemental informa-
    tion for each sale in the form of a sales worksheet.48 The sales
    worksheet must indicate whether the sale is qualified as an
    arm’s-length transaction for the sales file, providing an expla-
    nation for any sales deemed to be non-arm’s-length transac-
    tions.49 The transfer statements and the sales worksheets are
    sent from the county assessors to the Department of Revenue
    on a monthly basis.50
    The assessor’s opinion as to whether a sale qualifies as
    an arm’s-length transaction is presumed to be correct.51 The
    Department of Revenue’s property assessment division may
    42
    
    Id., ch. 12,
    § 001.01 (2009).
    43
    § 77-1327(2).
    44
    § 77-1327(3).
    45
    Neb. Rev. Stat. § 76-214 (Cum. Supp. 2014). See, also, § 77-1327(2); 350
    Neb. Admin. Code, ch. 12, § 003.01 (2009).
    46
    §§ 76-214 and 77-1327.
    47
    § 76-214(1).
    48
    350 Neb. Admin. Code, ch. 12, §§ 003.03 and 003.03A (2009). See, also,
    § 76-214(1).
    49
    350 Neb. Admin. Code, ch. 12, § 003.03C (2009).
    50
    § 76-214(1); 350 Neb. Admin. Code, ch. 12, §§ 003.01, 003.03, and
    003.03A.
    51
    350 Neb. Admin. Code, ch. 12, § 003.04 (2009).
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    override a county assessor’s determination of whether a sale
    qualifies as an arm’s-length transaction, but must give notice
    to the assessor of its decision in writing within 7 days.52 And
    it may not overturn a county commissioner’s determination
    that a sale qualifies or does not qualify as an arm’s length
    transaction unless it reviews the sale and determines that the
    assessor is incorrect.53 The process of disputing sales catego­
    rizations between county assessors and the Department of
    Revenue’s property assessment division is set forth in detail
    in regulation.54
    On an annual basis, county assessors must provide the
    Department of Revenue and the PTA an “abstract of the
    property assessment rolls.”55 According to the regulations, the
    “County Abstract of Assessment Report” for real property con-
    sists of, among other things, the AVU, characterized as “the
    Report of [the] Current Year’s Assessed Value for Properties
    Listed in the State’s Sales File.”56 Generating the AVU, accord-
    ing to the state “Sales File Practice Manual,” is “the process of
    populating current assessed values for the sales already located
    in the state sales file” for use in the assessment-to-sales ratio
    for the PTA’s report. That is, the AVU provides the state with
    the assessment information to match the sales information the
    state already has in its sales file through the real estate transfer
    statements and sales worksheets.
    The sales file is used as the basis for the PTA’s comprehen-
    sive sales assessment ratio studies.57 The PTA’s sales assess-
    ment ratio studies are used in their annual reports and opin-
    ions for each county to aid TERC in its equalization duties.58
    52
    
    Id., § 003.04D
    (2009).
    53
    
    Id. 54 Id.,
    §§ 003.04 to 003.04E (2009).
    55
    Neb. Rev. Stat. § 77-1514 (Cum. Supp. 2016).
    56
    350 Neb. Admin. Code, ch. 60, § 002.02A (2009).
    57
    § 77-1327(3). See, also, § 77-5027.
    58
    § 77-5027.
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    The reports for each county “contain statistical and nar-
    rative reports informing [TERC] of the level of value and
    the quality of assessment of the classes and subclasses of
    real property.”59
    2. TERC’s Equalization Orders
    (a) Area 2
    TERC ordered an 8-percent decrease to the valuation of
    Area 2. Both the PTA’s report and Baines in his testimony at
    the show cause hearing explained that the lower-value sales
    were skewing the data and that no change should be ordered
    for Area 2. TERC nevertheless ordered the decrease. Douglas
    County argues that this decision was unsupported by compe-
    tent evidence; was arbitrary, capricious, and unreasonable; and
    failed to conform to law. We agree.
    The PTA’s report showed that the median assessment-to-
    sales ratio for Area 2 was 104.82 percent. But whether a class
    or subclass of property falls within the acceptable range is to
    be “determined to a reasonable degree of certainty [by] relying
    upon generally accepted mass appraisal techniques,”60 which
    include the standards of the IAAO.61 As the IAAO standards
    explain, measures of central tendency, such as the median, “are
    point estimates and provide only an indication, not proof, of
    whether the level meets the appropriate goal.”62 Other statistics
    and factors must be considered to determine to a reasonable
    degree of certainty whether the median is a reliable indicator
    of central tendency.
    One of these factors is the COD, which measures the uni-
    formity or dispersion of assessments.63 The acceptable range
    59
    
    Id. 60 §
    77-5023(5).
    61
    442 Neb. Admin. Code, ch. 2, § 001.45.
    62
    Standard on Ratio Studies, supra note 20 at 33.
    63
    442 Neb. Admin. Code, ch. 9, § 002.04; Standard on Ratio Studies, supra
    note 20.
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    of COD under TERC’s regulations and the IAAO standards
    for residential real property is under 15 percent.64 The COD
    for Area 2 was 48.43 percent. This means that the average
    ­assessment-to-sales ratio of the sold properties is 48 percent
    above or below the median of 104 percent. While the median
    is at 104 percent, most properties in Area 2 are significantly
    above or significantly below this median. TERC’s 8-percent
    adjustment would not solve Area 2’s lack of assessment uni-
    formity, but would only shift the problem. The proper method
    for solving such problems of dispersion is “model recalibration
    and/or reappraisal,”65 not blanket equalization orders.
    The “acceptable range” of valuation must be determined
    by an established “indicator of central tendency,”66 which is
    defined as “[t]he result of measuring the tendency of most
    kinds of data to cluster around some typical or central value.”67
    If the assessment-to-sales ratios in a class or subclass of prop-
    erty suffer from such a lack of uniformity that the ratios do not
    “cluster around some typical or central value,” then there is
    no “central tendency” to measure.68 With a COD in Area 2 of
    48.43 percent, the data unquestionably does not cluster around
    the median. Reappraisal, not equalization, is the proper remedy
    for such a lack of uniformity.69
    Not only does Area 2 suffer from a lack of overall uni­
    formity of assessments, but there is a lack of uniformity
    between higher-value and lower-value properties, referred to
    as “regressive vertical inequity.” The PRD measures the uni-
    formity of assessment between higher- and lower-value prop-
    erties. The acceptable range of PRD under TERC’s regulations
    64
    442 Neb. Admin. Code, ch. 9, § 005.02; Standard on Ratio Studies, supra
    note 20.
    65
    Standard on Ratio Studies, supra note 20 at 18.
    66
    § 77-5023.
    67
    442 Neb. Admin. Code, ch. 9, § 002.10.
    68
    See, generally, 
    id. 69 See
    Standard on Ratio Studies, supra note 20.
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    and the IAAO standards for residential real property is 0.98
    to 1.03 (98 to 103 percent). The PRD for Area 2 is 1.22 (122
    percent). What this statistic shows is that lower-value proper-
    ties in Area 2 are significantly overassessed while higher-value
    properties are significantly underassessed. But like overall
    uniformity problems, vertical inequities are not solved by
    equalization orders, but, rather, “should be addressed through
    reappraisal or other corrective actions.”70
    The COD and the PRD show that there are significant prob-
    lems with the assessments in Area 2, but not problems that
    would be solved through the 8-percent decrease TERC ordered.
    Prior to the decrease, the median ratio for all sales of $15,000
    and over was 100.45 percent (which would round to 100 per-
    cent and be within the acceptable range) and the median ratio
    for all sales of $30,000 and over was 96.21 percent (right in the
    middle of the acceptable range). The decrease would leave the
    median ratio for all sales of $15,000 and over at 92.41 percent
    (at the bottom of the acceptable range) and the median ratio for
    all sales of $30,000 and over at 88.51 percent (well below the
    acceptable range). The decrease would only reduce the median
    for sales under $30,000 from 149 to 137 percent. Sales of
    $15,000 and over represent 554 of the 632 sales (87 percent) in
    the study for Area 2, while sales of $30,000 and over represent
    393 of 632 sales (62 percent).
    This data shows not only that the lower-price sales, as
    Baines and the PTA explained, were skewing the data, but also
    that an across-the-board equalization order would not solve
    the valuation problems in Area 2. The decrease would leave a
    large percentage of mid- to higher-value properties under the
    acceptable range, while making only a small dent in the level
    of overassessment of lower-value properties. It would leave the
    median ratio of all properties sold for over $30,000—represent-
    ing 62 percent of all the properties sold—below the statutory
    range at 88.51 percent; the median ratio for properties sold for
    70
    
    Id. at 29.
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    under $30,000 would still be well over the statutory range at
    137 percent. The problems in Area 2 with a lack of uniformity
    and regressive vertical inequity would not be solved by the
    decrease ordered by TERC. As the IAAO standards explain:
    States . . . that employ direct equalization techniques
    should understand that such equalization is not a sub-
    stitute for appraisal or reappraisal. . . . [E]qualization
    cannot improve uniformity between properties within a
    given [class or subclass of property]. For this reason,
    reappraisal orders should be considered as the primary
    corrective tool for uniformity problems . . . .71
    Before voting to decrease the valuation of Area 2, and in
    the course of questioning Baines, Commissioner Robert Hotz
    discussed his concern about how lower-value properties in the
    area were significantly overassessed, while mid- to higher-
    value properties were correctly or underassessed. He explained
    his reasoning for voting for the decrease:
    I don’t think [TERC] has the authority to [adjust only
    lower-value properties]. And so, to some degree, we
    look at this — and we’ve read the correlation section
    and we hear the [PTA’s] recommendation that we not
    do an adjustment on this. I’m hearing you say the same
    thing. And I’m looking at statistics that tell me these
    low-dollar properties are over-assessed. It’s got to be
    fixed. And I don’t think I have the authority to do it
    unless I take the higher-dollar properties, they get to
    kind of ride on the coattails of that adjustment, and then
    be under-assessed —
    ....
    . . . I don’t want that result either. Right now, the
    low-dollar properties are carrying the freight and they
    shouldn’t be. Now, it’s really hard to assess low-dollar
    properties for the reasons that you’ve explained. I kind of
    understand that.
    71
    Standard on Ratio Studies, supra note 20 at 21-22 (emphasis supplied).
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    (Emphasis supplied.) Hotz went on to say to Baines, “It’s a
    little frustrating to see what appears to be a significant area
    of your county where it appears to be over-assessed.” He
    explained that he thought ordering the decrease would be “the
    lesser of two evils” because there were more lower-value prop-
    erties than higher-value properties in the area, even though
    it would put the higher-value properties out of the accept-
    able range.
    Hotz’ and TERC’s desire to remedy the problems in Area
    2 is understandable. But across-the-board equalization orders
    are not a cure-all for every valuation ailment. The proper
    remedy for the lack of uniformity is reappraisal. Equalization
    is a blunt tool and cannot cure uniformity problems. TERC
    need not choose “the lesser of two evils”; its equalization
    tool is capable of solving only one “evil”: assessment levels
    that are out of range as determined to a reasonable degree of
    certainty by a reliable indicator of central tendency. Fixing the
    uni­formity problems is a task belonging to Douglas County.
    Baines testified that he was working on resolving the prob-
    lems in Area 2 (and across Douglas County) by doing things
    such as developing an entirely new valuation model that
    would bring the median ratio in Area 2 down to 97 per-
    cent and redrawing the borders between valuation areas to
    more accurately reflect market areas. These narrowly tailored
    approaches are a more proper approach for resolving the val­
    uation uniformity problems in Area 2.
    Given the fact that neither the PTA nor Douglas County
    presented evidence that would support TERC’s decision to
    decrease the valuations of Area 2, we cannot conclude that
    TERC’s decision was supported by competent evidence. As
    such, its order decreasing the valuation of Area 2 by 8 percent
    was therefore arbitrary, capricious, and unreasonable.
    (b) Areas 3 and 4
    TERC ordered a 7-percent increase to the valuation of
    Areas 3 and 4. Douglas County argues that this order was
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    unsupported by competent evidence; was arbitrary, capricious,
    and unreasonable; and failed to conform to law. We disagree.
    The PTA’s report shows that the median assessment-to-sales
    ratios for Areas 3 and 4 were 89.77 and 90.08 percent, respec-
    tively, falling outside the statutory range of 92 to 100 percent.
    But unlike in Area 2, the quality statistics show that the median
    is a reliable indicator of central tendency.
    The COD for Areas 3 and 4 was 15.27 and 12.49 percent.
    These are within or at the top of the acceptable range for the
    COD, which shows that Areas 3 and 4 are reasonably uniform.
    The PRD for Areas 3 and 4 was 1.0571 (105.71 percent) and
    1.0347 (103.47 percent), at or slightly above the top of the
    acceptable range of 0.98 to 1.03. While this shows some minor
    regressive vertical inequity, it is minimal—standing in stark
    contrast to the 1.22 (122 percent) PRD in Area 2.
    Moreover, the median confidence interval for Areas 3 and
    4 shows that the median ratios for these areas are accurate
    indicators of central tendency. The median 95-percent confi-
    dence interval for Area 3 is 89.43 to 90.28 percent. The median
    95-percent confidence interval for Area 4 is 89.73 to 90.5
    percent. Both of these ranges are entirely outside the accept-
    able range of 92 to 100 percent. Moreover, these ranges are
    very narrow, less than 1 percent, indicating a high degree of
    sample reliability. That is, the median assessment-to-sales ratio
    is likely to be a very reliable indicator of the ratio of assessed
    to actual value of other properties in those areas.
    There is very little in the PTA’s data that would show that
    the median ratios of Areas 3 and 4, which are below the accept-
    able range, are not accurate and reliable indicators of central
    tendency. Instead, Douglas County relies heavily on the testi-
    mony of Baines before TERC in the show cause hearing that
    alleged that the sales data itself was unreliable.
    Baines had been in the position of chief field deputy in
    the Douglas County register of deeds and assessor’s office
    since April 2015. Prior to taking that position, he worked as
    an appraiser for 28 years in Kansas, including in the Kansas
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    City area. When he began working as chief field deputy,
    Baines noticed problems with the existing appraisal practices
    in Douglas County. He stated that he “immediately started
    uncovering inconsistencies.” He realized that his staff was
    mostly not verifying sales to determine if they were qualified
    arm’s-length transactions usable in the PTA’s sales ratio study.
    Baines noticed that his predecessor had not completed any
    “scope of work” documents outlining how the assessments had
    been done each year. Vacant lots were “grossly undervalued” in
    some areas and “grossly overvalued” in others. Baines worked
    with the Department of Revenue’s property assessment divi-
    sion to implement sales verification training for his staff. He
    also sent out surveys to attempt to verify 2013 and 2014 sales
    that were significantly out of range.
    Baines said that after implementing changes in Douglas
    County’s assessing practices, he was surprised when he received
    the 2016 data from the state; many of the statistics had changed
    significantly. He said, “[T]here has to be something drasti-
    cally changing there to make that happen” and suspected that
    the change in the statistics after he arrived may have been the
    result of prior “sales chasing,” which is the improper practice
    of “using the sale of a property to trigger a reappraisal of that
    property at or near the selling price.”72 Sales chasing makes a
    sales ratio study unreliable because the assessed values of sold
    properties are no longer representative of the assessed values
    of all the other properties in the study area.73 Baines explained
    that if sales chasing had occurred, that meant that “the data
    that was submitted to [the Department of Revenue’s property
    assessment division] was manipulated to the point where it was
    in range [which] told me I couldn’t rely on those sales to value
    other properties.”
    Baines’ primary reason why he believed no changes should
    be made by TERC to the valuation of Areas 3 and 4 was
    72
    
    Id. at 43.
    73
    See Standard on Ratio Studies, supra note 20.
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    that the sales data underlying the PTA’s statistics was unreli-
    able. Because the underlying data was unreliable, Baines said,
    according to generally accepted standards of mass appraisal, no
    changes should be made.
    While Baines’ testimony raises some questions about the
    reliability of the data due to the practices of the Douglas
    County assessor’s office prior to his arrival, we do not find that
    TERC’s decision to order a 7-percent increase to the valuation
    of Areas 3 and 4 was unsupported by competent evidence or
    was arbitrary, capricious, and unreasonable. Baines testified
    about problems he observed in Douglas County’s assessment
    practices, such as not verifying sales. But his testimony that
    there may have been sales chasing was simply offered as a
    possible explanation for the surprising changes he observed
    in the data from 2015 to 2016. While this explanation could
    be correct, TERC was not unreasonable in failing to credit
    this explanation and nonetheless relying on the statistics based
    on the sales file data. Providing a few examples of improper
    procedures or practices does not establish beyond dispute that
    the sales file was unreliable. Our standard of review is a def-
    erential one. It is not our task to determine de novo whether
    the sales file data was so unreliable that no changes should be
    made, but, rather, our task is to determine whether TERC acted
    unreasonably in reaching its conclusion. We believe that TERC
    did not act unreasonably here. Its decision was supported by
    the evidence provided by the PTA. TERC’s decision to order
    a 7-percent increase in valuation for Areas 3 and 4 was sup-
    ported by competent evidence and was not arbitrary, capri-
    cious, and unreasonable.
    3. Motion to R econsider
    After TERC voted to order the valuation adjustments to
    Areas 2 through 4, but before it issued its written order,
    Douglas County submitted a motion to reconsider, request-
    ing a hearing and that TERC thereafter reconsider and vacate
    its prior order. Included with the motion was an affidavit by
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    Baines alleging that the PTA improperly included sales in her
    report that Douglas County has designated as non-arm’s-length
    transactions, without notifying the county as required by regu-
    lation. TERC voted 2-to-1 to deny the motion to reconsider.
    Douglas County argues that this was an abuse of discretion.
    We disagree.
    (a) Standard of Review
    [6,7] We have yet to address the applicable standard of
    review for a motion to reconsider in the administrative law
    context. A trial court’s decision to grant or deny a motion to
    reconsider is reviewed for an abuse of discretion.74 Similarly,
    the abuse of discretion standard applies to our review of a
    trial court’s grant or denial of a motion to vacate or amend
    a judgment.75
    [8] We conclude that the abuse of discretion standard should
    also apply to our review of the grant or denial of a motion to
    reconsider by an administrative body. An abuse of discretion
    occurs when a trial court’s decision is based upon reasons that
    are untenable or unreasonable or if its action is clearly against
    justice or conscience, reason, and evidence.76
    (b) Procedure
    First, TERC argues, citing cases from other jurisdictions,77
    that it is improper to use a motion to reconsider to raise evi-
    dence that could have been raised in the earlier proceeding. It
    also cites Nebraska case law in which we have held that grant-
    ing a motion for new trial on the basis of newly discovered
    74
    State v. Bao, 
    269 Neb. 127
    , 
    690 N.W.2d 618
    (2005); Frerichs v. Nebraska
    Harvestore Sys., 
    226 Neb. 220
    , 
    410 N.W.2d 487
    (1987); Gutchewsky v.
    Ready Mixed Concrete Co., 
    219 Neb. 803
    , 
    366 N.W.2d 751
    (1985). See
    Ryder v. Ryder, 
    290 Neb. 648
    , 
    861 N.W.2d 449
    (2015).
    75
    See Ryder v. Ryder, supra note 74.
    76
    State v. Cerritos-Valdez, 
    295 Neb. 563
    , 
    889 N.W.2d 605
    (2017).
    77
    J.P. v. Smith, 
    444 N.J. Super. 507
    , 
    134 A.3d 977
    (2016); Cho v. State, 
    115 Haw. 373
    , 
    168 P.3d 17
    (2007).
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    evidence is not proper when the evidence could have been
    discovered before trial with diligent inquiry.78
    But we have not previously considered whether new evi-
    dence, or evidence available at the time of the prior proceed-
    ing, may be now presented as the basis for a motion to recon-
    sider. In both the civil and the criminal context, the grounds
    upon which a motion for new trial may be granted are limited
    by statute and include newly discovered evidence.79 But there
    is no statute or court rule that limits a motion for reconsidera-
    tion to newly discovered evidence. And in other contexts, we
    have distinguished a motion for reconsideration from a motion
    for new trial.80
    [9] We have held that an administrative agency that is autho-
    rized to exercise quasi-judicial power is impliedly authorized
    to reconsider its own decisions.81 TERC’s regulations allow it
    to reconsider any order it has issued during its statewide equal-
    ization proceedings.82
    We have explained that a motion for reconsideration is noth-
    ing more than an invitation to the court to consider exercising
    its inherent power to vacate or modify its own judgment.83
    In some contexts, a motion for reconsideration may also be
    treated as a motion to alter or amend a judgment for pur-
    poses of terminating the appeal period under Neb. Rev. Stat.
    § 25-1329 (Reissue 2016).84
    As to a motion to reconsider, it appears to be an open ques-
    tion whether an administrative agency or commission acting
    78
    See Maddox v. First Westroads Bank, 
    199 Neb. 81
    , 
    256 N.W.2d 647
          (1977).
    79
    See Neb. Rev. Stat. §§ 25-1142 and 29-2101 (Reissue 2016).
    80
    Kinsey v. Colfer, Lyons, 
    258 Neb. 832
    , 
    606 N.W.2d 78
    (2000).
    81
    City of Lincoln v. Twin Platte NRD, 
    250 Neb. 452
    , 
    551 N.W.2d 6
    (1996);
    Ventura v. State, 
    246 Neb. 116
    , 
    517 N.W.2d 368
    (1994).
    82
    442 Neb. Admin. Code, ch. 9, § 009.07 (2011).
    83
    Kinsey v. Colfer, Lyons, supra note 80.
    84
    State v. Bellamy, 
    264 Neb. 784
    , 
    652 N.W.2d 86
    (2002).
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    in an adjudicatory capacity can consider additional evidence
    that does not constitute newly discovered evidence. But we
    need not decide that issue here, because we conclude that
    even if the evidence presented by Douglas County could be
    considered, TERC did not abuse its discretion in denying
    the motion.
    4. Douglas County’s Motion
    and A ffidavit
    Douglas County’s motion and affidavit question whether the
    state improperly included non-arm’s-length transactions in its
    sales file and the PTA’s report. The county based its allegations
    on a comparison between the county’s AVU and the state sales
    file. It alleges that sales which it categorized as non-arm’s-
    length transactions, thus not usable in a sales ratio study, were
    included in the PTA’s assessment ratio study.
    The county argues that this violates TERC’s regulations.
    Those regulations require county assessors, when sending a
    sales worksheet to the state, to “indicate numerically on the
    sales worksheet their opinion as to whether the sale is quali-
    fied or non-qualified for inclusion in the sales file as an arm’s
    length transaction.”85 The Department of Revenue’s property
    assessment division may verify a county assessor’s categori-
    zation of a sale, but when doing so, “the assessor’s opinion
    with respect to the inclusion, exclusion or adjustment of a
    sale shall be presumed correct.”86 The property assessment
    division may override a county assessor’s categorization of a
    sale in some circumstances if it does not agree with it, but if
    it does so, it “shall, within seven (7) days of such determina-
    tion, notify the county assessor in writing that the sale will
    not be included in or excluded from the sales file.”87 The
    property assessment division did not provide Douglas County
    85
    350 Neb. Admin. Code, ch. 12, § 003.03C.
    86
    
    Id., § 003.04.
    87
    
    Id., § 003.04D
    .
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    notice of its intent to recategorize and include in the sales
    file and the PTA’s report the sales that the county had cat-
    egorized as sales nonusable in the AVU. Therefore, Douglas
    County argues, the PTA improperly included the sales in her
    study and TERC should have granted the motion to dismiss
    and vacate its ordered changes that were based on the PTA’s
    report data.
    But as TERC points out, the AVU is not the vehicle by
    which county assessors inform the state about a sale’s usability
    in the sales file. Rather, the AVU is the vehicle by which asses-
    sors provide assessment information to match the sales that are
    already in the state sales file. The information about whether a
    transaction qualifies as an arm’s-length transaction usable in a
    ratio study is sent from the county assessor to the state in the
    sales worksheet for each sale, filed on a monthly basis.88 The
    AVU is merely the vehicle for conveying the assessment infor-
    mation to match those sales, sent on an annual basis.89
    Critically, Douglas County has not alleged that the catego-
    rization of sales used in the PTA’s report differs from that
    of the sales data sent to the state by Douglas County in the
    sales worksheets. If there is, in fact, a difference between
    the categorization of sales in the AVU and that of sales in
    the PTA’s report, it is not clear whether the difference results
    from a discrepancy between the categorizations of sales in
    the county’s sales worksheets and the PTA’s report or from
    a discrepancy between the county’s sales worksheets and the
    county’s AVU.
    Douglas County’s motion and affidavit fail to allege that
    the PTA improperly included sales that the county designated
    in the sales worksheets as nonusable. The purpose of the AVU
    is to send assessment information to match the sales informa-
    tion (including categorization as to usability) already in the
    sales file. Douglas County’s allegations are insufficient to
    88
    
    Id., §§ 003.01,
    003.03, 003.03A, and 003.03C.
    89
    
    Id., ch. 60,
    § 002.02A. See, also, § 77-1514(1).
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    establish that the PTA improperly included non-arm’s-length
    sales in her report.
    In its motion to reconsider and affidavit, Douglas County
    also alleges that the PTA included sales in the wrong valuation
    area in her sales ratio study. Specifically, it alleges that the
    PTA included 327 sales from Area 6 in Area 3 and included
    526 sales from Area 3 in Area 4. As in the alleged inclusion
    of non-arm’s-length sales, Douglas County contends that this
    renders the data underlying the PTA’s report unreliable and
    an insufficient basis upon which to rely to order equaliza-
    tion changes.
    But these allegations could have been raised before TERC
    at the show cause hearing. Douglas County had the ability to
    access the state sales file at any time.90 We have declined to
    conclude that Douglas County is procedurally barred from pre-
    senting previously available evidence in support of its motion
    to reconsider. But the fact remains that it could have presented
    such evidence at the show cause hearing. This fact supports our
    determination that TERC did not abuse its discretion by deny-
    ing the motion. After the PTA produced her report for Douglas
    County on April 8, 2016, that recommended that the value of
    Areas 3 and 4 be increased, the county had ample time to com-
    pare the sales file relied upon by the PTA with its own sales
    information and present any discrepancies it found to TERC at
    the show cause hearing on April 27. Instead, Douglas County
    filed its motion to reconsider and its affidavit in support on
    May 4.
    Not only did Douglas County unnecessarily delay the pre-
    sentation of these alleged discrepancies to TERC until after the
    show cause hearing, but the allegations provide no information
    as to the impact of the alleged errors. The motion and affi-
    davit provide no information that would establish the impact
    of the allegation that sales from other areas were improperly
    included in Areas 3 and 4. There was no evidence showing
    90
    See, 350 Neb. Admin. Code, ch. 12, §§ 001.02 and 003.08 (2009).
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    Nebraska Supreme Court A dvance Sheets
    296 Nebraska R eports
    COUNTY OF DOUGLAS v. NEBRASKA TAX EQUAL. & REV. COMM.
    Cite as 
    296 Neb. 501
    the sales that were alleged to have been improperly included
    affected whether the ratios in Areas 3 and 4 fell within the
    acceptable range. The allegations do not state whether these
    sales would have increased or decreased the median ratio in
    those areas or would have made no difference at all. Thus,
    TERC was presented with allegations, but not proof of Douglas
    County’s assertions.
    While Douglas County’s allegations raised questions whether
    there were problems with the sales information relied upon by
    the PTA in producing the report for Douglas County, these
    allegations did not provide any answers. Douglas County could
    have raised these allegations at the show cause hearing, and
    offered the evidence in support, but it failed to do so. TERC
    did not abuse its discretion when it denied Douglas County’s
    motion to reconsider, and we affirm.
    VI. CONCLUSION
    TERC’s order to decrease the valuation of Area 2 by 8 per-
    cent was not supported by competent evidence and was arbi-
    trary, capricious, and unreasonable. TERC’s order to increase
    the valuation of Areas 3 and 4 was supported by competent
    evidence and was not arbitrary, capricious, and unreasonable.
    TERC did not abuse its discretion in denying Douglas County’s
    motion to reconsider its order. We reverse TERC’s order as to
    Area 2 and affirm in all other respects.
    A ffirmed in part, and in part reversed.
    Miller-Lerman, J., not participating.