Aurum - 171 West 131 Street
1. BUILDING OVERVIEW (ANALYST FRAMING)
Building Type: New Development Condo (Built 2015).
Scale: 8 Floors, 115 Units.
Primary Category: Yield-Oriented.
Justification: Post-sponsor data indicates a building trapped in a severe post-development price-discovery phase. Initial market-rate sponsor sales cleared rapidly at elevated pricing ($1,050–$1,300+/SF) between 2016 and 2017. However, the mature resale market (2021–2026) has demonstrated massive friction, with structural depreciation pulling valuations down to a $690–$1,000/SF baseline. This severe mean-reversion has entirely decoupled the asset from the NYXRCSA benchmark, which pushed to historic highs of 330–333 in late 2025 and early 2026. With capital preservation failing and structural secondary market illiquidity (DOM frequently 100-230+ days), the building functions solely as a Yield-Oriented asset via its rental capture on smaller layouts.
2. UNIT MIX & COMPOSITION Based on historic sales data and transaction weighting across market sales:
Studio: ~5% of sales volume.
1BR: ~52% of sales volume.
2BR: ~39% of sales volume.
3BR+: ~4% of sales volume.
Influence on Liquidity & Rent Behavior: The building is heavily anchored by 1BR and 2BR units. While these units form the backbone of the building's rental capture—processing tenants with moderate efficiency—they suffer catastrophic illiquidity on the sales side. The lack of deep secondary demand creates a structural drag, causing even the highly-concentrated 1BR units to frequently sit for 100 to 230+ days when attempting to offload to secondary buyers.
3. LINE (STACK) PERFORMANCE — RESALE ONLY
A. Liquidity
Fastest Resale Velocity: True resale liquidity is structurally broken. The rare efficient clears (e.g., Unit 403 in 48 days, Unit 314 in 59 days) represent extreme outliers dependent on precise market timing or heavy discounting.
Slowest Resale Velocity: Most lines sit for chronic, destructive durations. In recent years, Unit 620 sat for 236 days, 311 for 233 days, 317 for 213 days, and 603 for 140 days.
B. Price Strength
Initial sponsor premium stacks have collapsed. 1BR and 2BR units that successfully commanded $1,100+/SF at launch have corrected to a baseline of roughly $700–$950/SF today.
C. Appreciation
Lines are universally mean-reverting. The building currently exhibits negative compounding on a line-by-line basis. Value destruction is consistent across all layouts in early resale data, driven purely by the deflation of the sponsor's initial premium.
4. BUILDING-WIDE PPSF TREND (NORMALIZED)
2016–2017 (Sponsor Peak): High volume clearing at $1,050–$1,300/SF.
2021–2023 (Initial Normalization): Resales begin facing heavy resistance, settling to $900–$1,000/SF alongside days-on-market expansions.
2024–2026 (Drawdown / Current Baseline): A drastic reset, settling at $690–$960/SF. Conclusion: Depreciating / Mean-Reverting. Value is currently adjusting downward from original sponsor inflation, completely failing to track the continuous macro growth trend proven by the NYXRCSA index.
5. RENT CAPTURE ANALYSIS
A. Rent Capture by Line & Unit Type
Formula: Effective Annual Rent = Achieved Rent × (365 − Rental DOM) ÷ 365
Example 1 (High Efficiency): Unit 611 (2BR). Achieved $4,700/mo. DOM 35. Effective Rent = $4,700 × (365 - 35) ÷ 365 = $4,249/mo.
Example 2 (Moderate Drag): Unit 408 (1BR). Achieved $3,000/mo. DOM 61. Effective Rent = $3,000 × (365 - 61) ÷ 365 = $2,498/mo.
Example 3 (Severe Leakage): Unit 515 (2BR). Achieved $4,395/mo. DOM 161. Effective Rent = $4,395 × (365 - 161) ÷ 365 = $2,456/mo.
B. Rent Appreciation Rent per SF performs moderately well, generally yielding $45 to $60/SF. Despite the capital destruction seen on the resale market, the building captures yield relatively efficiently on its smaller units, though occasional severe DOM outliers (e.g., 90–160+ days) destroy localized line yields.
6. B³ SCORING SYSTEM (0–100)
Liquidity Score: 25
Speed: Failing. Normalized resale DOM routinely exceeds 100 to 200+ days.
Consistency: Low. Extreme friction on the secondary market.
Rent Capture Score: 65
Efficiency: Moderate ($45–$60/SF).
Absorption: Volatile. Good baseline offsets but heavily dragged down by units experiencing 90+ day rental gaps.
Appreciation Score: 15
Durability: Failing. Widespread equity loss on all recorded post-sponsor market trades compared to their initial stack pricing baselines.
7. COMPOSITE SCORE & CLASSIFICATION
Composite Score = (25 × 0.35) + (65 × 0.30) + (15 × 0.35) = 33.50 Category Assignment: Yield-Oriented. The asset completely fails defensive or appreciation criteria, functioning purely as a rental income vehicle at its new discounted basis.
8. TRANSACTION EXAMPLES
Resale Depreciation (Structural Baseline Shifts): (Note: No true structural appreciation examples exist in the dataset due to uniform post-sponsor price deflation. The following examples compare original sponsor clearing prices against mature resale attempts within matching lines).
Unit 509 (1BR): Feb 2017 Sponsor Trade ($1,313/SF) → Feb 2021 Resale ($913/SF). Held 4 years. -30% change. Driver: Sponsor price normalization.
Unit 621 (1BR): Nov 2016 Sponsor Trade ($1,076/SF) → Jul 2021 Resale ($934/SF with 100 DOM). Held 4.6 years. -13% change. Driver: Sponsor price normalization + Liquidity shift (DOM change).
Unit PH2 (3BR): Aug 2017 Sponsor Trade ($1,092/SF) → Sep 2022 Resale ($1,017/SF with 152 DOM). Held 5.1 years. -6.8% change. Driver: Sponsor price normalization + Liquidity shift (DOM change).
Unit 403 (1BR): Dec 2016 Sponsor Trade ($1,025/SF) → Feb 2022 Resale ($1,001/SF). Held 5.2 years. -2.3% change. Driver: Sponsor price normalization.
9. RISKS & RED FLAGS
Catastrophic Resale Illiquidity: Resale units sit for massive intervals (e.g., 140, 213, 233, 236 days), indicating near-total illiquidity when attempting to exit the asset.
Severe Sponsor Price Normalization: Early buyers who paid $1,050–$1,300+/SF have suffered immediate capital destruction upon trying to clear the secondary market, entirely disconnected from the broader NYC benchmarks pushing to record highs.
Avoid: Do not buy any unit in this building anticipating a quick exit or capital appreciation. The friction costs (time value of money via 150+ DOMs) and structural price resets destroy equity.
10. EXECUTIVE SUMMARY
Aurum Condominium (171 West 131st Street) is a Yield-Oriented new development currently trapped in a punishing sponsor price normalization phase. Early market-rate buyers who funded the initial 2016–2017 closings at $1,050–$1,300/SF have seen subsequent resale values structurally decay to a new $690–$960/SF baseline, thoroughly decoupling from the all-time highs of the broader NYXRCSA index. Secondary market liquidity is severely impaired, with average resales enduring 100 to 230+ days on market before finding clearing bids. Despite these capital preservation failures, the building's heavily concentrated 1BR and 2BR layouts perform functionally as rental vehicles, capturing moderate yields with standard vacancy. Investors should strictly avoid this asset for defensive storage or appreciation, utilizing it exclusively to farm rental income at the newly discounted cost basis.
