An informed estimate of your Manhattan apartment’s current market value.
The analysis begins with comparable sales in your building and expands to nearby properties only when necessary — the comparables and confidence range presented alongside the result.
The underlying research encompasses more than 330,000 recorded co-op, condominium, and townhouse transactions across 11,600 Manhattan buildings, including more than 2,200 buildings researched in depth.
The valuation methodology was tested against historical Manhattan sales. For each backtest, the model estimated a past transaction using only information that would have been available before the sale occurred. Inputs were retained only when they improved out-of-sample accuracy. Recorded sales are adjusted for changes in the surrounding market, and comparable selection gives priority to apartments of the same type within the subject building.
The result identifies:
- the source of the comparable evidence;
- the number and relevance of the underlying sales;
- whether the analysis is building-specific or neighborhood-supported;
- the historical error range associated with that evidence profile.
| Valuation treatment | Comparable evidence | Historical median error |
|---|---|---|
| High confidence | Four or more comparable sales in the building | Approximately 12% |
| Moderate confidence | Two or three comparable sales in the building | Approximately 16% |
| Indicative range | Comparable apartments in nearby buildings | Approximately 21% |
| Individual review | Unusual property type, configuration, value range, or limited sales history | Reviewed separately |
In historical testing, 85.8% of eligible co-op sales received an automated valuation across the first three evidence tiers.
The analysis begins with the most relevant available evidence:
- Comparable apartments in the same building
- Other relevant sales within the building
- Comparable apartments in nearby buildings
- Corridor and broader neighborhood evidence where appropriate
Non-arm’s-length transfers and co-op sponsor sell-outs are excluded where they can be identified from the public record. Ordinary resale transactions in converted buildings remain eligible.
Recorded prices are adjusted to current market conditions using local price indexes rather than treated as directly comparable without regard to sale date.
No automated valuation can observe every characteristic that affects the sale of an individual Manhattan apartment.
Renovation quality, condition, views, light, exposure, outdoor space, layout, ceiling height, and the specific desirability of an apartment line can materially affect value. These considerations are particularly important for highly renovated residences, combined apartments, penthouses, maisonettes, large co-ops, and other properties with limited direct comparables.
The Roebling Valuation is an analytical estimate based on recorded market evidence. It is not an appraisal or a substitute for an apartment-specific pricing analysis.
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