ALEX · Alexander Tiffany Southwest, LLC – ALEX Companies

The ALEX Model Patent Pending

How ALEX values a home
Updated October 17, 2026alex-companies.com/real-estate/alex-model/

ALEX Model

Sale price
1 · Seller concessions
2 · Time adjustment
3 · ALEX Model & Agent Changes
4 · Additional Agent Changes
5 · SF adjustment
6 · Size correction
ALEX Model valuation
1 · Seller concessionsThe sale price less the buyer’s closing costs and repairs the seller paid, as recorded in the MLS
2 · Time adjustmentEach sale brought to today with ALEX’s repeat-sales index for the county
3 · ALEX Model & Agent ChangesEach difference from the home — bathrooms, garage, lot size, view, age and the rest — priced at what ABOR closed sales in the same price range show the market pays; any line the agent revises is shown as the agent’s
4 · Additional Agent ChangesAny line the agent adds, shown as the agent’s
5 · SF adjustmentThe adjusted price per SF times the home’s SF
6 · Size correctionLarger homes sell for less per SF, as measured on the market
WeightSales most like the home count for more, whether ALEX or the agent selected them
ALEX valuationThe weighted average of the sales, with the lowest, median and highest beside it

How the two models differ

Standard Arithmetic Model
  1. Sale price per SF for each comparable sale
  2. The average of those prices per SF
  3. Times the home’s SF, from the MLS listing

Example: $200 × 2,500 SF = $500,000. Every sale counts the same and nothing is adjusted.

ALEX Model
  1. Closed sales like the home, chosen by ALEX’s selection rules or by the agent
  2. Each sale adjusted to match the home, steps 1–6
  3. Weighted by how closely it matches

Every adjustment for every sale is itemized in the report’s detailed valuations.

A comparable-sales opinion of value is not a certified appraisal and not a mortgage or lending document. Sale and listing data: ABOR MLS via secure APIs. ALEX Companies · Licensed by the Texas Real Estate Commission · Broker: Alexander Tiffany Southwest, LLC, #565194-BB · Diane Hart Alexander, Designated Broker, #574877-B.