357 recorded events, 1966–2026, from 15 city data systems. The city's paper trail here is mostly 104 311 service requests, 73 ACRIS deeds & mortgages, 43 HPD housing violations.
Full record, year by year Support this site
A meaningful record of code violations or complaints relative to its peers. More recorded distress than 90% of 6-24-unit residential buildings citywide. The citywide median for 6-24-unit residential buildings is 16.3 penalty points per 10 units; this building carries 198.4. In ZIP 10023, 77% of residential buildings hold an A and 3% grade D or F. How grades work
Among 46,798 6-24-unit residential buildings citywide · left is less recorded distress, right is more
| Pending HPD litigation | 2 case(s) pending in housing court |
status snapshot refreshed weekly from HPD records
2 heat or hot-water complaints in the last three years (winter 2024–25: 2).
No bedbug-infested units reported in the last three years of filings.
$11,280 in enforcement penalties imposed (ECB/OATH) in the last three years.
68 service requests in the last three years. Most common: Noise (12) · Asbestos (9) · General Construction/Plumbing (7) · WATER LEAK (6) · Real Time Enforcement (6) · UNSANITARY CONDITION (4).
$1,124,600 in permitted construction work filed since 2016 (11 filings with a declared cost) — a rough measure of how actively the owner maintains the building. Permit costs cover filed construction work only — they do not capture routine maintenance or repairs done without a permit.
| Yes | Built before 1974 (1882) |
| Yes | Six or more residential units (11) |
| No | 421-a / J-51 tax benefit on the current tax roll |
2 of 3 signals present. This is the classic profile of a rent-stabilized building (pre-1974, 6+ units) — many units in such buildings remain stabilized. The definitive answer for any unit: request its rent history from NYS Homes & Community Renewal (free, at hcr.ny.gov).
| Registered owner(s) | BROWNSTONE HOUSING CORP |
| Head officer | MARK DOYLE |
| Managing agent | CORNERSTONE MGMT SYSTEMS INC |
| Last registered | 2025-11-24 |
as filed by the owner in the building's HPD registration
| Tax year | City market value | Assessed value |
|---|---|---|
| 2025 | $1,387,000 | $624,150 |
| 2026 | $1,464,000 | $658,800 |
| 2027 | $1,537,000 | $691,650 |
The city's market estimate has risen 11% between tax years 2025 and 2027.
For property tax, the Department of Finance values this co-op as if it were a rental building. Its 2022 estimate: gross income $276,250 a year ($50.00 per sq ft), operating expenses $79,892 ($14.46 per sq ft), net operating income $196,359. These are the city's estimates from comparable rentals, not the building's actual budget, rents or maintenance charges.
Not in the FEMA 1%-annual-chance floodplain (2015 preliminary maps).
Not in a hurricane evacuation zone.
Not in the city's stormwater (cloudburst) flood maps under any modeled scenario.
No street-flooding or sewer-backup complaints on record at this address.
Sources: FEMA flood maps (coastal), NYC DEP Stormwater Flood Maps (cloudburst), NYC hurricane evacuation zones, and 311 records for this address.
| Subway | 72 St — 1 2 3 · 400 ft straight-line (about a 2-minute walk) · station accessibility: full 72 St — B C · 0.3 mi straight-line (about an 8-minute walk) · station accessibility: none |
| Bus | Nearest boarding stop: Broadway / W 73 St — M104 · 300 ft |
| Citi Bike | Amsterdam Ave & W 73 St · 200 ft · station location as of 2026-09-23; live availability |
| School zones (2024–25 map) | Elementary: P.S. 087 William Sherman. Confirm with the DOE's school search. |
Distances are straight-line, not walking routes. Transit locations from the MTA and Citi Bike, bike facilities from NYC DOT, school zones from the DOE's 2024–25 maps.
171 West 73 Street
| Heat or hot water | Heat or hot water |
| Apartment maintenance | Apartment maintenance |
| Bed bugs | Bed bugs |
| Residential pests | Residential pests |
| Rats or mice | Rats or mice |
| Anything else | Anything else |
68 311 service requests from this address in the last three years — 1 of them about heat or hot water.
311 will ask for the address, the apartment if the problem is inside, and what's wrong. Contact details are optional for most complaints; food-poisoning reports can be anonymous. Complaints appear in the city's public 311 data, usually within a day or two, and then in the Live from 311 box on this page.
Managed by CORNERSTONE MGMT SYSTEMS INC — 113 buildings, 1,524 units. Grades across the portfolio: A94 · B12 · C6. See the whole portfolio
showing 60 of 113 buildings
Most recent mortgage recorded against this lot: $7,500,000 on 2022-08-01 (lender: National Consumer Cooperative Bank), covering 2 lots — the amount covers all of them. Face amount at recording — it may have since been paid down, refinanced or satisfied. View the recorded document.
| Date | Record | Amount | Per res. unit |
|---|---|---|---|
| 2023-10-11 | RPTT&RET $325,000 — from BROWNSTONE HOUSING CORP. to SHVARTS, ALIZA | $325,000 | |
| 2023-06-28 | Sold for $325,000 | $325,000 | $29,545 |
| 2023-02-13 | RPTT&RET $425,000 — from SCHNEIDER, JONATHAN MICHAEL to MILLSTEIN, STEVEN A; MILLSTEIN, JONATHAN | $425,000 | |
| 2023-02-02 | Sold for $425,000 | $425,000 | $38,636 |
| 2022-08-15 | RPTT&RET $625,000 — from VOSS, TIMOTHY S; VOSS, TANIA to BROWNSTONE HOUSING CORP. | $625,000 | |
| 2022-08-01 | Sold for $625,000 | $625,000 | $56,818 |
| 2022-08-01 | Mortgage $7,500,000 — from BROWNSTONE HOUSING CORP. to NATIONAL CONSUMER COOPERATIVE BANK | $7,500,000 | |
| 2022-08-01 | AL&R $750,000 — from BROWNSTONE HOUSING CORP. to NATIONAL CONSUMER COOPERATIVE BANK | $750,000 | |
| 2022-04-27 | RPTT&RET $560,000 — from MICHELS, MOLLY; MICHELS, KAREN to SHVARTS, ALIZA | $560,000 | |
| 2022-04-07 | Sold for $560,000 | $560,000 | $50,909 |
| 2020-12-28 | RPTT&RET $742,500 — from GUIJARRO, LUIS to YOHANNAN, KIMBERLY M; YOHANNAN, JONATHAN C | $742,500 | |
| 2020-12-03 | Sold for $742,500 | $742,500 | $67,500 |
| 2019-09-19 | Mortgage $250,000 — from BROWNSTONE HOUSING CORP. to NATIONAL CONSUMER COOPERATIVE BANK | $250,000 | |
| 2019-09-19 | Mortgage $1,000,000 — from BROWNSTONE HOUSING CORP. to NATIONAL CONSUMER COOPERATIVE BANK | $1,000,000 | |
| 2019-09-19 | AL&R $1,000,000 — from BROWNSTONE HOUSING CORP. to NATIONAL CONSUMER COOPERATIVE BANK | $1,000,000 |
| Year | Construction | Enforcement | Housing & tenants | Ownership & money | Health & systems | Total |
|---|---|---|---|---|---|---|
| 2017 | 0 | 1 | 3 | 4 | 2 | 10 |
| 2018 | 0 | 1 | 2 | 2 | 1 | 6 |
| 2019 | 0 | 1 | 4 | 12 | 1 | 18 |
| 2020 | 0 | 0 | 5 | 2 | 0 | 7 |
| 2021 | 6 | 0 | 4 | 0 | 0 | 10 |
| 2022 | 0 | 0 | 13 | 8 | 1 | 22 |
| 2023 | 2 | 0 | 12 | 4 | 1 | 19 |
| 2024 | 0 | 6 | 65 | 0 | 1 | 72 |
| 2025 | 7 | 11 | 55 | 0 | 6 | 79 |
| 2026 | 3 | 6 | 17 | 0 | 0 | 26 |
Every one of the 357 recorded events, 1966–2026, is laid out year by year in the full report (print-ready).
Explore: ZIP 10023 · Landlord rankings · How grades work · The map · The Mice Map