Methodology: This analysis applies derivative calculus price momentum methodology to MLS listing-volume data. A 180-day rolling moving average smooths episodic listing events into a continuous supply signal. The first derivative (d¹) captures the instantaneous rate of supply change; the second derivative (d²) reveals whether that rate is accelerating or decelerating — providing forward-looking context no static count can offer. Savitzky-Golay polynomial smoothing (window=101 days, order=3) is applied to minimize noise while preserving inflection points.
This analysis draws on 399 MLS listing records spanning April 2000 through March 2026 — exclusively within MLS Area 175 (Peninsula Center) for homes in the 2,000–2,500 square foot living area cohort. Of these 399 total listings: 309 closed (77%), 50 were cancelled (13%), 36 expired (9%), and 3 remain active with 1 active under contract. The data represents one of the most complete longitudinal supply records available for this highly specific submarket segment.
Buyer Intelligence: With only 6 listings hitting the market in the past 180 days — well below the 26-year annual average of 15 — this cohort remains structurally undersupplied. Buyers pursuing Peninsula Center homes in the 2,000–2,500 SF range are operating in a thin-inventory environment where patience, preparation, and speed-to-offer are decisive advantages.
Projections are derived from three converging inputs: (1) the recent-year seasonal pattern (2020–2025 monthly averages), (2) a 10% downward adjustment reflecting the current negative first derivative (momentum still trending below the rolling peak), and (3) a modestly positive second derivative that signals deceleration in the rate of decline — a potential inflection point forming.
Seasonal Peak — June & July
Historical seasonal analysis identifies June and July as the highest-volume listing months in this cohort, averaging 2.2 and 2.0 new listings per month respectively over the 2020–2025 period. Buyers who are pre-approved and pre-positioned to act in this window gain access to the broadest available selection of the year.
Derivative Signal — Potential Bottom
The second derivative (d²) has turned positive at the current date (+0.0047/day²), signaling that although the 180-day rolling supply is still declining, the rate of that decline is decelerating. This is a classic precursor to inflection — a supply recovery may be forming ahead of the June seasonal surge.
The 180-day rolling window aggregates every listing within a trailing six-month period into a single continuous signal, smoothing the episodic nature of individual MLS entries. The chart below spans 2010–2026 at 15-day intervals, allowing clear visibility into supply cycles, pandemic-era compression, and the current post-peak correction.
Reading the Chart: The 180-day rolling count peaked near 24–26 listings in 2013–2015, compressed to a historic low during the 2020–2021 COVID era, briefly rebounded in late 2025 to ~13, and has since declined to the current 6 listings in the trailing 180 days. This is the second-lowest recorded 180-day count in the 2020–2026 period, underscoring the thinness of current supply.
The calculus-based derivative framework transforms a raw listing count into a directional intelligence signal. Applied to the 180-day rolling average, these derivatives reveal not just where supply stands, but where it is going and how fast it is getting there — critical dimensions for timing a purchase decision.
d¹ measures how rapidly the 180-day listing supply is expanding or contracting, expressed in listings per 30-day period. Positive d¹ = supply accelerating upward. Negative d¹ = supply retreating. The current reading is mildly negative (–0.52 listings/30 days), reflecting the post-October 2025 peak pullback. Historically, sustained negative d¹ periods lasting 60–90 days have preceded the next seasonal surge — which in this cohort is June–July.
d² measures whether d¹ itself is speeding up or slowing down — the concavity of the supply curve. Current d² = +3.11 (per 30-day²), a distinctly positive reading. This means the pace of supply decline is decelerating — the curve is bending upward even though d¹ remains negative. In calculus terms, the supply function is approaching a local minimum. This is the earliest and most sensitive signal of an impending recovery in listing volume.
Derivative Interpretation for Buyers: The combined signal of a negative d¹ and positive d² constitutes what analysts call a deceleration phase preceding inflection. Supply is contracting, but the contraction is losing momentum. Buyers who enter the market now do so with less competition (fewer buyers tracking thin inventory) while positioning ahead of the June–July seasonal surge that historical patterns strongly predict. Acting before d¹ turns positive means buying before the crowd re-enters.
Median Price Per Square Foot — 2018 to 2026
| Year | Median PSF | YoY Change |
|---|---|---|
| 2018 | $572.63 | — |
| 2019 | $603.57 | +5.4% |
| 2020 | $632.34 | +4.8% |
| 2021 | $732.78 | +15.9% |
| 2022 | $861.27 | +17.5% |
| 2023 | $801.42 | –6.9% |
| 2024 | $847.72 | +5.8% |
| 2025 | $814.59 | –3.9% |
| 2026 YTD | $887.52 | +8.9% YTD |
Median Days on Market (DOM) — 2018 to 2026
| Year | Median DOM | Signal |
|---|---|---|
| 2018 | 20 days | Balanced |
| 2019 | 25.5 days | Softening |
| 2020 | 8 days | 🔥 Hot |
| 2021 | 9 days | 🔥 Hot |
| 2022 | 10 days | 🔥 Hot |
| 2023 | 11 days | Competitive |
| 2024 | 21 days | Normalizing |
| 2025 | 48 days | ⬇ Cooling |
| 2026 YTD | 10 days | Active (n=1) |
Sale-to-List Ratio
The median closed transaction in this cohort closed at 98.4% of original list price — meaning buyers typically negotiate a modest discount. However, the interquartile range spans 94.6%–101.1%, indicating meaningful variance: well-priced, move-in-ready homes still attract above-ask offers while overpriced listings sit and discount.
Pricing Context
Median original list price across all 399 listings is $1,195,000, with the most recent closed sales in 2025–2026 transacting in the $1.1M–$1.6M range. At $887/SF median in 2026 YTD, a 2,200 SF home implies ~$1.95M — reflective of premium coastal positioning and land scarcity.
Buyer Takeaway — DOM Expansion is Your Leverage Window: The jump from 10-day median DOM in 2022 to 48 days in 2025 represents a paradigm shift in negotiating conditions. Sellers who listed in 2025 spent nearly 7 weeks on market on average — creating genuine room for buyers to negotiate price, terms, and contingencies that were simply unavailable during the 2020–2022 frenzy. If DOM normalizes toward 2026's early reading of 10 days, that window narrows. Acting in Q2 2026 may represent the optimal entry: more supply coming (seasonal surge), still-elevated DOM from 2025 conditioning still influencing seller psychology.
The dominant configuration in Peninsula Center's 2,000–2,500 SF cohort is the 4-bedroom, 3-bathroom layout, representing the prototypical Peninsula family home. At 72% view prevalence, most listings in this size range offer some elevation-derived visual amenity — from city lights to harbor to canyon — which is a structural value driver unique to the Peninsula geography and largely unavailable at comparable price points in neighboring South Bay communities.
View Type Distribution — Top 10
Buyer Strategy Note — Configuration & View Premium: Buyers targeting a 4BR/3BA with City Lights view are competing for the most common configuration — expect the sharpest competition and most aggressive pricing on these. Buyers with flexibility toward 5BR layouts (26% of supply) or non-City-Lights view types (harbor, canyon, panoramic) may find relatively less competition and more negotiating latitude, while still acquiring genuine Peninsula view assets. The 2-bath, 3-bedroom segment (10% of supply) represents the entry point to this cohort and often attracts renovation-ready buyers.
