800 W 1st St #1604

What this estimate rests on:

• Recent sales of comparable units inside this same building.
• This unit’s own previous sale price, carried forward to today by a paired-resale index — not sale evidence from other units.
• This unit’s own recorded sale, which is the strongest single piece of evidence there is.

How much weight we put on it: Low — one input only, or a ceiling only, or our inputs disagree with each other. Read the notes below before you decide anything.

Our market estimate for this unit comes in 0.1% above its assessed value.

Our own leave-one-out error is 5.98% at the median, 12.28% at the 75th percentile and 19.36% at the 90th. That error sits on top of every figure on this page, and on a large share of units it is wider than the gap itself.

• The County's assessed value is within 5% of this unit's own most recent sale price. A real open-market sale is stronger evidence than any estimate we can produce — R&T §110 defines full cash value as the open-market price. So we do not claim this unit is over-assessed. That would take separate evidence that the market fell between the sale date and the lien date (1/1).

These notes are generated for this specific unit from County records and our own valuation inputs. If anything here does not match the unit, email [email protected].

• Everything above is an estimate. It is not an appraisal and not a promise about the outcome.
• The Assessment Appeals Board has the authority to raise the value, though never above the Proposition 13 protected value.
• A comparable sale must have been recorded no later than March 31, 2026. That is a hard rule on Form RP-87.
• Asking the Assessor for a review is free. You can do it yourself and you don't need us.

Parcel number 5151027112 · See other units in this building