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Date:   6/27/2004                        COMPTROLLER OF PUBLIC ACCOUNTS - PROPERTY TAX DIVISION                         Page:      1
Time:     21:23                                      2003 Property Value Study                                          Rpt: VAL7000
                                                     Confidence Interval Detail
                                                        227-910-227 Del Valle

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                                                              (1)                         (2)
  (1)                  (1)                        (1)       Stratum         (1)         Sample
Stratum              Category                 Local Value    Ratio      State Value      Size
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  1      A  - Single-family Residences        118,317,193     .8938     132,375,468       38
  2      A  - Single-family Residences        118,466,709     .8815     134,392,183       74
  3      A  - Single-family Residences        118,317,193     .9211     128,452,061       66
  4      A  - Single-family Residences        118,416,871     .9846     120,269,014       73
  5      B  - Multi-family Residences          82,879,035     .9806      84,518,698        8
  6      B  - Multi-family Residences         134,347,294    1.0237     131,236,978        3
  7      D  - Rural Real                      164,298,117     .9759     168,355,484       21
  8      F  - Commercial Real                 105,847,895     .8995     117,674,147        8
  9      F  - Commercial Real                 104,348,383    1.0236     101,942,539        6
 10      F  - Commercial Real                 104,039,660    1.0325     100,764,804        6
 11      F  - Commercial Real                 104,921,725    1.0660      98,425,633        5
 12      L  - Commercial Personal              74,391,748     .9745      76,338,377        7
 13      L  - Commercial Personal              74,267,295     .9441      78,664,649        7
 14      L  - Commercial Personal              73,147,218    1.0141      72,130,182        7
 15      L  - Commercial Personal              73,831,710    1.0275      71,855,679        4

Random Totals:                              1,569,838,046             1,617,395,896      333
 Cat J Exception Values:                                0                         0
 Cat D1 Exception Values:                      14,678,529                14,952,873
 Other Exception Values:                       96,721,000                95,078,523
Exception Totals(3):                          111,399,529               110,031,396
Test Values(4):                             1,681,237,575             1,727,427,292

Margin of Error Percent:                                    5.0000000
Margin of Error Value:                                     86,371,365
Confidence Interval Values:
  State Lower Limit:                                    1,641,055,927  (State Test Value Minus Margin of Error Value)
  Local Test Value:                                     1,681,237,575  (Within Confidence Interval Limits)
  State Upper Limit:                                    1,813,798,657  (State Test Value Plus Margin of Error Value)
Value Assigned (5):                                     2,091,271,306  (See ISD Summary Worksheet)


Sources:

(1) See Stratified Ratio Detail Report VAL7214.
(2) Number of parcels sampled by staff.
(3) Exception value includes, if tested, D1, the J sample, and any parcels in A,B,C,D,F1,G or L1 marked as exception properties.
(4) Unstudied categories and sub-categories were not included in the test values.
(5) Includes local value of unstudied property categories and sub-categories.