452 recorded events, 2000–2026, from 13 city data systems. The city's paper trail here is mostly 152 ACRIS deeds & mortgages, 63 DOB complaints, 45 311 service requests.
Full record, year by year Support this site
The city's published records show little recorded distress here in the last three years. Less recorded distress than 70% 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 6. In ZIP 11222, 66% of residential buildings hold an A and 5% grade D or F. How grades work
Among 46,798 6-24-unit residential buildings citywide · left is less recorded distress, right is more
No current HPD flags in the latest weekly snapshot: no open violations, no pending litigation, no active vacate orders, and not in the Alternative Enforcement Program.
No heat or hot-water complaints in the last three years.
No bedbug-infested units reported in the last three years of filings.
24 service requests in the last three years. Most common: Blocked Driveway (10) · Noise (4) · Illegal Parking (2) · Abandoned Bike (2) · Overgrown Tree/Branches (2) · Missed Collection (1).
$68,000 in permitted construction work filed since 2016 (7 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.
| No | Built before 1974 (2019) |
| Yes | Six or more residential units (10) |
| No | 421-a / J-51 tax benefit on the current tax roll |
1 of 3 signals present. Only a partial profile — stabilization is possible but less likely. The definitive answer for any unit: request its rent history from NYS Homes & Community Renewal (free, at hcr.ny.gov).
| Registered owner(s) | 91 Diamond Street Condominium |
| Head officer | Emma Hagendorf |
| Managing agent | Brownstone Management LLC |
| Last registered | 2025-07-09 |
as filed by the owner in the building's HPD registration
| Tax year | City market value | Assessed value |
|---|---|---|
| 2025 | $387,252 | $174,263 |
| 2026 | $372,331 | $167,549 |
| 2027 | $491,435 | $221,145 |
The city's market estimate has risen 27% between tax years 2025 and 2027.
Not in the FEMA 1%-annual-chance floodplain (2015 preliminary maps).
Hurricane evacuation zone 2 of 6 — zone 1 evacuates first.
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 | Nassau Av — G · 0.2 mi straight-line (about a 6-minute walk) · station accessibility: none |
| Bus | Nearest boarding stop: Nassau Av / Newel St — B48 · 300 ft |
| Citi Bike | Nassau Ave & Newell St · 300 ft · station location as of 2026-09-23; live availability |
| School zones (2024–25 map) | Elementary: P.S. 110 The Monitor. 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.
91 Diamond 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 |
24 311 service requests from this address in the last three years.
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 BROWNSTONE MANAGEMENT LLC — 97 buildings, 821 units. Grades across the portfolio: A65 · B12 · C15 · D5. See the whole portfolio
showing 60 of 97 buildings
| Date | Record | Amount | Per res. unit |
|---|---|---|---|
| 2025-08-05 | Agreement $990,000 — from WOJSZYNSKI, KATHERINE; WOJSZYNSKI, ANDREW to JPMORGAN CHASE BANK, N.A. | $990,000 | |
| 2021-12-16 | Agreement $1,196,000 — from SZENDIUCH, ASHLEY L; SZENDIUCH, JOHN A to WELLS FARGO BANK, N.A. | $1,196,000 | |
| 2021-09-02 | Deed $977,000 — from 91 DIAMOND MANAGEMENT LLC to WERNICK, NATHANIEL; CANESTRARO, JULIA | $977,000 | |
| 2021-09-02 | Mortgage $859,500 — from CANESTRARO, JULIA; WERNICK, NATHANIEL to U.S. BANK NATIONAL ASSOCIATION | $859,500 | |
| 2021-09-02 | Mortgage $1,366,200 — from SILVER, DANIELLE; SILVER, BENJAMIN to MERS, INC.; TD BANK, N.A. | $1,366,200 | |
| 2021-08-30 | Deed $1,375,000 — from 91 DIAMOND MANAGEMENT LLC to WOODARD, LUKE F; GALLACHER, MADISON | $1,375,000 | |
| 2021-08-30 | Mortgage $1,100,000 — from WOODARD, LUKE F; GALLACHER, MADISON to MERS | $1,100,000 | |
| 2021-08-11 | Deed $1,498,551 — from 91 DIAMOND MANAGEMENT LLC to SILVER, BENJAMIN; SILVER, DANIELLE | $1,498,551 | |
| 2021-07-30 | Agreement $910,000 — from ALPERT, NIELS to CITIZENS BANK, N.A. | $910,000 | |
| 2021-07-27 | Agreement $1,160,000 — from COUTRIX-STANSKI, STEPHANIE NICOLE; STANSKI, KEITH RAYMOND RUSSEL to WELLS FARGO BANK, N.A. | $1,160,000 | |
| 2021-07-15 | Deed $1,306,766 — from 90 DIAMOND MANAGEMENT LLC to AXELRAD, KENNETH; LEVENTER, JAN | $1,306,766 | |
| 2021-07-15 | Mortgage $971,213 — from AXELRAD, KENNETH; LEVENTER, JAN to WELLS FARGO BANK NA | $971,213 | |
| 2021-07-09 | Deed $1,459,661 — from 91 DIAMOND MANAGEMENT LLC to STEIN, DANIEL; HAGENDORF, EMMA | $1,459,661 | |
| 2021-07-09 | Mortgage $910,000 — from STEIN, DANIEL; HAGENDORF, EMMA to MERS | $910,000 | |
| 2021-07-07 | Agreement $747,778 — from 91 DIAMOND MANAGEMENT LLC to VALLEY NATIONAL BANK | $747,778 |
| Year | Construction | Enforcement | Housing & tenants | Ownership & money | Health & systems | Total |
|---|---|---|---|---|---|---|
| 2017 | 25 | 3 | 1 | 0 | 1 | 30 |
| 2018 | 8 | 39 | 0 | 0 | 1 | 48 |
| 2019 | 14 | 52 | 0 | 0 | 1 | 67 |
| 2020 | 4 | 17 | 0 | 20 | 1 | 42 |
| 2021 | 6 | 5 | 7 | 129 | 0 | 147 |
| 2022 | 6 | 17 | 11 | 0 | 0 | 34 |
| 2023 | 0 | 1 | 8 | 2 | 0 | 11 |
| 2024 | 0 | 3 | 4 | 0 | 0 | 7 |
| 2025 | 0 | 1 | 15 | 1 | 0 | 17 |
| 2026 | 0 | 0 | 5 | 0 | 1 | 6 |
Every one of the 452 recorded events, 2000–2026, is laid out year by year in the full report (print-ready).
Explore: ZIP 11222 · Landlord rankings · How grades work · The map · The Mice Map