Building Biography

The MapLandlordsNeighborhoodsZIP CodesGradesThe Mice MapAboutWhat's new

520 Union Avenue

258Records
19City systems
0Open violations
14.4Penalty rate
Brooklyn · ZIP 11211 · Neighborhood: Williamsburg
Open in the map

258 recorded events, 1986–2026, from 19 city data systems. The city's paper trail here is mostly 127 311 service requests, 38 HPD housing violations, 23 ACRIS deeds & mortgages.

BoroughBrooklyn 11211
Built1928
Floors3
Res. units5
ClassC2
Owner (PLUTO)520 UNION OWNER LLC
BBL3027410001
BIN3068236, 3379885

Full record, year by year   Support this site

GRADE B

A modest record — below the level that usually signals systemic problems. More recorded distress than 86% of 1-5-unit residential buildings citywide. The citywide median for 1-5-unit residential buildings is 0 penalty points per 10 units; this building carries 14.4. In ZIP 11211, 58% of residential buildings hold an A and 7% grade D or F. How grades work

this building
A
C

Among 699,345 1-5-unit residential buildings citywide · left is less recorded distress, right is more

Open with the city right now

Pending HPD litigation1 case(s) pending in housing court

status snapshot refreshed weekly from HPD records

Patterns

No heat or hot-water complaints in the last three years.

No bedbug-infested units reported in the last three years of filings.

What 311 hears from this address

17 service requests in the last three years. Most common: Sewer (5) · Noise (4) · Outdoor Dining (3) · New Tree Request (1) · Overgrown Tree/Branches (1) · Illegal Parking (1).

Filed construction activity

$301,900 in permitted construction work filed since 2016 (5 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.

Rent-stabilization signals

YesBuilt before 1974 (1928)
NoSix or more residential units (5)
No421-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 with HPD — the names behind the building

Registered owner(s)520 Union Owner LLC
Head officerAlex Kaskel
Managing agentApex Management Group
Last registered2025-08-15

as filed by the owner in the building's HPD registration

What the city thinks it's worth

Tax yearCity market valueAssessed value
2025$2,145,000 $965,250
2026$2,286,000 $1,028,700
2027$2,743,000 $1,234,350

The city's market estimate has risen 28% between tax years 2025 and 2027.

Building systems

Heating fuelNATURALGAS

Flood exposure

Inside the 2007 FEMA floodplain but outside the 2015 preliminary update — worth checking against current FEMA maps.

Hurricane evacuation zone 3 of 6 — zone 1 evacuates first.

Not in the city's stormwater (cloudburst) flood maps under any modeled scenario.

3 street-flooding or sewer-backup complaints at this address since 2024 (3 in the last three years).

Sources: FEMA flood maps (coastal), NYC DEP Stormwater Flood Maps (cloudburst), NYC hurricane evacuation zones, and 311 records for this address.

Getting around

SubwayLorimer St — G L · 700 ft straight-line (about a 4-minute walk) · station accessibility: full
BusNearest boarding stop: Lorimer St / Jackson St — B48 · 550 ft
Citi BikeUnion Ave & Jackson St · 100 ft · station location as of 2026-09-23; live availability
Bike facilityShared bike route mapped within 75 ft
School zones (2024–25 map)Elementary: P.S. 017 Henry D. Woodworth. 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.

Report a problem to 311

520 Union Avenue

Heat or hot waterHeat or hot water
Apartment maintenanceApartment maintenance
Bed bugsBed bugs
Residential pestsResidential pests
Rats or miceRats or mice
Anything elseAnything else

17 311 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.

The landlord's report card

Managed by APEX MANAGEMENT GROUP — 88 buildings, 882 units. Grades across the portfolio: A34 · B31 · C16 · D5 · F2. See the whole portfolio

BuildingBoroughUnitsGrade
11-55 45 Avenue QN46 C
233 East 10 Street MN40 A
308 East 78 Street MN35 A
231 East 21 Street MN24 A
110 Madison Street MN24 C
233 East 21 Street MN24 A
245 East 13 Street MN24 B
972 Manhattan Avenue BK24 B
119 Baxter Street MN22 B
111 Mott Street MN22 C
32-30 41 Street QN20 A
250 North 6 Street BK20 B
33 Henry Street MN18 B
243 East 13 Street MN18 B
212 8 Avenue MN17 C
423 16 Street BK16 B
419 16 Street BK16 B
412 Amsterdam Avenue MN13 B
414 Amsterdam Avenue MN13 A
416 Amsterdam Avenue MN12 B
410 Amsterdam Avenue MN12 C
202 West 80 Street MN10 C
204 West 80 Street MN10 B
72 5 Avenue BK10 B
70 Middagh Street BK10 A
197 East 7 Street MN10 C
495 Amsterdam Avenue MN9 C
251 North 8 Street BK8 B
444 15 Street BK8 B
154 Atlantic Avenue BK8 A
31-64 41 Street QN8 C
101 Greenpoint Avenue BK8 A
253 North 8 Street BK8 A
453 3 Street BK8 A
111 Huron Street BK8 A
94 Milton Street BK8 B
311 Eckford Street BK8 A
333 East 52 Street MN7 A
230 West 72 Street MN7 C
41-27 49 Street QN6 A
47-25 44 Street QN6 A
53-17 Skillman Avenue QN6 D
50-11 45 Street QN6 F
47-34 45 Street QN6 B
39-29 47 Avenue QN6 B
35-21 Crescent Street QN6 A
47-16 45 Street QN6 A
47-45 43 Street QN6 A
45-44 40 Street QN6 B
84 1 Place BK6 B
799 Manhattan Avenue BK6 A
37 Frost Street BK6 B
149 Ainslie Street BK6 A
28-52 35 Street QN6 D
35-34 32 Street QN6 A
586 Manhattan Avenue BK6 B
5-35 47 Road QN6 A
515 Graham Avenue BK6 A
25-59 35 Street QN6 A
53-11 Skillman Avenue QN6 B

showing 60 of 88 buildings

Sales, deeds & mortgages

Most recent mortgage recorded against this lot: $2,850,000 on 2023-03-21 (lender: First Horizon Bank). Face amount at recording — it may have since been paid down, refinanced or satisfied. View the recorded document.

DateRecordAmountPer res. unit
2024-10-03AL&R $2,850,000 — from 520 UNION OWNER LLC to FIRST HORIZON BANK $2,850,000
2024-10-03Agreement $2,850,000 — from 520 UNION OWNER LLC to FIRST HORIZON BANK $2,850,000
2024-09-23Sold for $1,000,000 $1,000,000 $200,000
2023-03-21AL&R $2,850,000 — from 520 UNION OWNER LLC to FIRST HORIZON BANK $2,850,000
2023-03-21Deed $3,175,000 — from ELIZONDO, ANNA; CARLSON, FRANCES; SCHLESIER, FELICIA; ASTORE, JOSEPHINE; ASTORE, LINDA; WA to 520 UNION OWNER LLC $3,175,000
2023-03-21Mortgage $2,850,000 — from 520 UNION OWNER LLC to FIRST HORIZON BANK $2,850,000
2023-03-15Sold for $3,175,000 $3,175,000 $635,000

Ten-year activity

50250
41
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
ConstructionEnforcementHousing & tenantsOwnership & moneyHealth & systems
Show as table
YearConstructionEnforcementHousing & tenantsOwnership & moneyHealth & systemsTotal
201700410041
201801120316
2019006017
2020001012
202101330135
20226090116
2023611511033
202410910020
2025203005
2026008019
This record is free. Keeping it free costs money.
Servers, data pipelines, weekends. Pay what you want — a dollar helps.
Chip in

The full timeline

Construction 22Enforcement 11Housing & tenants 191Ownership & money 25Health & systems 9

Every one of the 258 recorded events, 1986–2026, is laid out year by year in the full report (print-ready).

Explore: ZIP 11211 · Landlord rankings · How grades work · The map · The Mice Map