Created on November 11, 2026 Market Data Source: SDAR 10K Research
2121 Seagull Ln
San Diego, CA 92123
3 bd · 2 ba · 1,442 sqft · Sold on May 16, 2017
Estimates Update
United Home Price Estimate
$1,035,433
Based on the automated model estimates below, checked on Nov. 11, 2026.
vs Last sold price $580,000: +$455,433 · +78.5%
This value is based on the automated valuation models (AVMs) listed below. This is a home price estimate prepared by United Home Teams, Inc. based on automated calculations from available data online. This is not a formal appraisal. Tap any model for how its value works.
Local Market Performance
92123 · Detached · October 2026
Median Sales Price$952,450−7.0% vs last year−4.8% vs last month
Sales to List Price Ratio97.2%−2.2% vs last year−1.4% vs last month
Months Supply of Inventory2.6 mo+36.8% vs last year+44.4% vs last month
Avg. Days on Market31 days+29.2% vs last year+47.6% vs last month
Serra Mesa detached homes cooled on price in October: the median fell 7.0% year over year to $952,450 — on just 8 closed sales, so that median moves easily — while sellers still closed at 97.2% of asking and supply stayed tight at 2.6 months. Homes took about 31 days to sell.
Market Heat Meter
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Zillow — Zestimate®: $1,022,300 (range $961,000 – $1.08M). Just above the Redfin figure — the two consumer-facing models land within about $7K of each other here.
The best-known consumer automated valuation model (AVM) in the U.S., built from public records, MLS data, and user-submitted facts on hundreds of millions of homes.
Published accuracy: median error about 1.77% for on-market homes and about 7% for off-market homes. The wider off-market error is the honest caveat — without a live listing, the model cannot see condition or upgrades.
MLS-driven AVM
Redfin — Redfin Estimate: $1,015,280. The lowest of the three verified headlines — up about $435K since the May 2017 sale, and up about $17K since October.
Redfin is both a brokerage and a portal, so its estimate draws directly on MLS data and hundreds of data points — Redfin cites 500+ — including listing details other portals may not receive as quickly.
Published accuracy: median error about 1.85% on-market and about 7.25% off-market — very close to Zillow, with a different data emphasis.
Aggregator · Not a standalone model
Homes.com — average of 4 AVMs: $1,068,719 (range $1,020,000 – $1,095,000; values based on Sep 2026). The highest headline; its four lender-grade components cluster within $75K of each other, from $1,020,000 to $1,095,000.
Homes.com does not run its own valuation model — it aggregates four lender-grade AVMs and averages them: Collateral Analytics $1,020,000 · ICE Mortgage Technology $1,095,000 · First American $1,082,000 · Quantarium $1,077,876.
Collateral Analytics is now part of ICE via Black Knight; ICE Mortgage Technology powers a large share of U.S. mortgage origination; First American is a title-data giant whose records cover 99% of U.S. deeds, mortgages, and foreclosures; Quantarium is an AI-driven model trained on parcel and imagery data.
Our method
United Home Price Estimate: $1,035,433.
It is the equal-weight average of the headline estimates verified on this page:
No single algorithm sees a home the way an appraiser walking through it would. Averaging independent models — consumer, MLS-driven, and aggregated — smooths out any one model’s blind spots and outliers.
Heat score · 59 / 100 · Balanced
How the 59 is built — each SDAR 10K Research input is scored 0–100 by band, then weighted:
Months Supply of Inventory — 2.6 mo Score 80 · × 40% = 32
Sales to List Price Ratio — 97.2% Score 60 · × 25% = 15
Days on market — 31 days Score 60 · × 20% = 12
Median price YoY — −7.0% Score 0 · × 15% = 0
Heat = 0.40 × Supply + 0.25 × Sales to List Price Ratio + 0.20 × DOM + 0.15 × Median YoY
Why balanced? Inventory and negotiating terms still lean toward sellers — only 2.6 months of supply and closings at 97.2% of asking — but price momentum does not: the median is down 7.0% year over year, which scores zero, and 31 days on market sits mid-band. Together they land at 59, the top of the balanced band, just short of seller’s territory.
Industry anchor (NAR): under 4 months of supply is a seller’s market, 4–6 balanced, over 6 a buyer’s market — which is why supply carries the largest weight.
