273 recorded events, 1984–2026, from 14 city data systems. The city's paper trail here is mostly 108 ACRIS deeds & mortgages, 71 311 service requests, 23 HPD housing violations.
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 86% 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 1.5. In ZIP 10022, 72% of residential buildings hold an A and 6% grade D or F. How grades work
Among 46,798 6-24-unit residential buildings citywide · left is less recorded distress, right is more
| Open HPD violations | 16 total — 2 class C (immediately hazardous), 9 class B, 5 class A. Oldest open since 2010-09-08. |
status snapshot refreshed weekly from HPD records
No heat or hot-water complaints in the last three years.
1 bedbug-infested unit(s) reported in filings over the last three years.
5 service requests in the last three years. Most common: Standing Water (2) · Curb Condition (1) · New Tree Request (1) · Homeless Person Assistance (1).
$5,000 in permitted construction work filed since 2016 (1 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 (1902) |
| Yes | Six or more residential units (10) |
| 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) | RIVERRUN CONDOMINIUM |
| Head officer | JEFF ELDERS |
| Managing agent | MARBROSE REALTY |
| Last registered | 2025-10-14 |
as filed by the owner in the building's HPD registration
| Tax year | City market value | Assessed value |
|---|---|---|
| 2025 | $330,522 | $148,735 |
| 2026 | $383,345 | $172,505 |
| 2027 | $396,630 | $178,483 |
The city's market estimate has risen 20% between tax years 2025 and 2027.
| Heating fuel | NATURALGAS |
Not in the FEMA 1%-annual-chance floodplain (2015 preliminary maps).
Hurricane evacuation zone 6 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 | 51 St — 6 E F · 0.3 mi straight-line (about a 9-minute walk) · station accessibility: full Grand Central-42 St — 4 5 6 7 S · 0.5 mi straight-line (about a 14-minute walk) · station accessibility: full |
| Bus | Nearest boarding stop: 1 Av / Mitchell Pl — M15 M15-SBS · 300 ft · Select Bus Service |
| Citi Bike | E 51 St & 1 Ave · 350 ft · station location as of 2026-09-23; live availability |
| School zones (2024–25 map) | Elementary: P.S. 059 Beekman Hill International Middle: J.H.S. 104 Simon Baruch. 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.
421 East 50 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 |
5 311 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 MARBROSE REALTY INC — 41 buildings, 505 units. Grades across the portfolio: A38 · B3. See the whole portfolio
| Date | Record | Amount | Per res. unit |
|---|---|---|---|
| 2020-12-21 | Mortgage $11,421 — from ELDERS, JEFFREY; WALKER-ELDERS, DAWN to NAVY FEDERAL CREDIT UNION | $11,421 | |
| 2020-12-21 | Agreement $500,993 — from WALKER-ELDERS, DAWN; ELDERS, JEFFREY to NAVY FEDERAL CREDIT UNION | $500,993 | |
| 2019-03-15 | Mortgage $418,837 — from JAISINGHANI, EKTA to CITIZENS BANK, N.A. | $418,837 | |
| 2019-03-15 | Deed $558,450 — from MOFAZ, ZVIEL to JAISINGHANI, EKTA | $558,450 | |
| 2019-03-11 | Sold for $558,450 | $558,450 | $55,845 |
| 2016-12-27 | Deed $362,500 — from KORZILIUS, HELMUT to DUQUE GROUP HOLDINGS, LLC | $362,500 | |
| 2016-12-22 | Sold for $362,500 | $362,500 | $36,250 |
| 2016-03-22 | Deed $560,000 — from KORZILIUS, HELMUT to YAMADA HOLDINGS LLC | $560,000 | |
| 2015-12-01 | Mortgage $528,750 — from WALKER-ELDERS, DAWN; ELDERS, JEFFREY to NAVY FEDERAL CREDIT UNION | $528,750 | |
| 2015-12-01 | Deed $520,000 — from KORZILIUS, HELMUT to ELDERS, JEFFREY; WALKER-ELDERS, DAWN | $520,000 | |
| 2015-11-30 | Deed $370,000 — from KORZILIUS, HELMUT to MARC CHOWDHURY SAVARD, PETER; CHOWDHURY SAVARD, MOITRI | $370,000 | |
| 2015-11-04 | Mortgage $357,588 — from VARETTONI, ROBERT A; VARETTONI, NANCY C to RBS CITIZENS, N.A. | $357,588 | |
| 2015-11-04 | Deed $510,840 — from KORZILIUS, HELMUT to VARETTONI, NANCY C; VARETTONI, ROBERT A | $510,840 | |
| 2015-01-20 | Deed $800,000 — from HARDEN, ARTHUR to NICHOLSON, TRUSTEE, JAN; JAN NICHOLSON LIVING TRUST DATED FEBRUAR | $800,000 | |
| 2014-04-14 | Deed $475,000 — from G & L PROPERTIES INC. to MOFAZ, ZVIEL | $475,000 |
| Year | Construction | Enforcement | Housing & tenants | Ownership & money | Health & systems | Total |
|---|---|---|---|---|---|---|
| 2017 | 0 | 1 | 12 | 1 | 3 | 17 |
| 2018 | 0 | 1 | 5 | 1 | 4 | 11 |
| 2019 | 0 | 1 | 1 | 6 | 2 | 10 |
| 2020 | 2 | 0 | 8 | 3 | 3 | 16 |
| 2021 | 0 | 0 | 3 | 1 | 2 | 6 |
| 2022 | 0 | 0 | 36 | 0 | 2 | 38 |
| 2023 | 0 | 0 | 4 | 0 | 2 | 6 |
| 2024 | 0 | 0 | 5 | 0 | 3 | 8 |
| 2025 | 0 | 0 | 1 | 0 | 3 | 4 |
| 2026 | 0 | 0 | 1 | 0 | 2 | 3 |
Every one of the 273 recorded events, 1984–2026, is laid out year by year in the full report (print-ready).
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