This is an estimate for planning, from Zillow's ZIP-wide typical values applied to your purchase price. It is not an appraisal, a broker price opinion, an offer, a loan offer, or tax or legal advice, and Rudy is a real estate agent, not a lender, appraiser or tax professional.
How the estimate works
- The page looks up Zillow's typical value in 92154 for homes of your type at your purchase date and at the latest date in the data.
- It scales your price by the change between those dates, then spreads a range around the result based on condition.
- For an original loan it assumes fixed-rate payments every month from the month after closing, and calculates what is left.
- Equity is the middle estimate minus the balance; the net also removes your selling costs, before income tax.
- The Prop 13 number takes your price and applies the inflation factor set for each tax year by the State Board of Equalization, never above 2%.
Your Prop 13 value and Prop 19
Your tax bill is based on Prop 13 taxable value, which begins at your purchase price and goes up 2% a year at most. If you bought in Otay Mesa years ago, today's market value is likely higher than that taxable value.
Owners 55 or older may qualify under Proposition 19 to keep their taxable value when they move: the replacement home can be anywhere in California, it must be bought within two years of the sale, and the transfer works up to three times. The county assessor has the final word.
Worth a look next: the downsizing calculator and how supplemental property tax bills work.
Sources and dates
- Zillow Research, Zillow Home Value Index (ZHVI) by ZIP code: all homes, single-family and condo; middle tier, smoothed and seasonally adjusted (data through September 2026, files updated Oct 16, 2026)
- FHFA House Price Index for five-digit ZIP codes (annual, developmental index, not seasonally adjusted; 2000 = 100), used only for purchases before Zillow's series begin. Citation: Bogin, Doerner and Larson, Local House Price Dynamics: New Indices and Stylized Facts, FHFA Working Paper 16-01 (annual, through 2025)
- Freddie Mac Primary Mortgage Market Survey (PMMS): weekly 30-year and 15-year fixed averages; the page uses the mean for your purchase month (monthly means through October 2026; latest weekly 30-year average 7.24% on Oct 29, 2026)
- California State Board of Equalization, Letter To Assessors No. 2026/002: inflation factors for 1976-77 through 2026-27, with Revenue and Taxation Code section 51 and California Constitution article XIII A, section 2(b) (January 13, 2026)
- California State Board of Equalization, Proposition 19 (checked Oct 30, 2026)
- Assumptions, not sourced figures: the condition range (the same rule of thumb as the home value range tool), 6% selling costs, 20% down, regular payments on a fixed-rate loan starting the month after you bought, and the first inflation factor applying on the first January 1 after your purchase
Questions owners ask
Is this the price my Otay Mesa home would sell for?
It is an estimate from a ZIP-wide index, so treat it as a ballpark. Your home's size, lot and condition can move a real sale outside the range. For a figure grounded in actual sales, Rudy prepares a free value.
Why not use my own street?
Street-level data needs actual recent sales, and those are what Rudy reviews for you. For measuring change since your purchase, a monthly ZIP index back to 2000 is steadier.
I took out a home equity line. How do I show that?
Select the second loan choice and enter the total you owe today on the first loan and the line. The calculator will not estimate payments then.
Does Prop 13 value equal market value?
No. The taxable value only grows by up to 2% a year from your purchase price, so it often trails the market. Your county bill states the official number.
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