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J

Jack Kornblum

Shareholder·2 buildings·37 units
4.2

4 reviews

Highlights

No
Evictions
1
Litigation cases

Renter recommendations

-%

Renters recommend associated buildings

-%

Renters approve of this owner or associate

Reviews

Former tenant·2 weeks ago

261 Lexington was a lovely home

Pros

The landlord is generous and responsive. The men he employs to fix things are nice and consistent. They clean up the hallways and the street every few weeks, and have an optional exterminator 1 time a month.

Cons

Not much to say. A little bit of water damage from the roof but it's NY.

Former tenant·Over 1 year ago

Great building in a great neighborhood

Pros

Mostly safe (had one stolen package and one random guy sleeping in the front in 2 years), apt D was newly renovated, easy to live there

Cons

A lot of construction (couldn’t do much about that though) and it’s done by now, we had an ant problem for a while

Buildings associated with JACK KORNBLUM

  • 20 Sidney Place
    Rent-stabilized

    20 Sidney Place

    3.6(3)

    Brooklyn Heights

  • 261 Lexington Avenue
    Good cause

    261 Lexington Avenue

    4.8(1)

    Bedford-Stuyvesant

20 Sidney Place
Rent-stabilized

20 Sidney Place

3.6(3)

Brooklyn Heights

261 Lexington Avenue
Good cause

261 Lexington Avenue

4.8(1)

Bedford-Stuyvesant

Building ratings

Cleanliness

-

Trash management

-

Pest control

-

Water pressure

-

Heat

-

Neighbors

-

Noise levels

-

Owner responsiveness

-

Cleanliness

-

Trash management

-

Pest control

-

Water pressure

-

Heat

-

Neighbors

-

Noise levels

-

Owner responsiveness

-

Rents and deposits

-

Renters received their security deposits back

-

Electronic rent payments

Open violations

From past 10 years · Updated 5 days ago

Average violations per unit for this owner or associate is better than the city average.

Owner average0.16Violations per unit
NYC average0.81Violations per unit
2Class C
Immediately hazardous

Rodents, pest, mold, inadequate heat or hot water, defective building parts

2Class B
Hazardous

Smoke detector issues, inadequate lighting, no lighting for stairways

2Class A
Non-hazardous

No peephole on a door, no street number on the building, unlawful keeping of animals

0Class I
Missing info

Missing or non-compliant with administrative information orders or filings

J

Jack Kornblum

Shareholder·2 buildings·37 units
4.2

4 reviews

Follow us

For renters

Apartments for rent in NYCRenting tips and resourcesVerified apartment listings in NYCBuildings and owners in NYCBuildings in BostonNYC market analysis reports

For landlords

iglooIQListings quality policy

Trending neighborhoods

Apartments in AstoriaApartments in Bedford-StuyvesantApartments in BushwickApartments in ChelseaApartments in Financial DistrictApartments in SohoApartments in Upper East SideApartments in Upper West SideApartments in West VillageApartments in Williamsburg

NYC boroughs

Apartments in BronxApartments in BrooklynApartments in ManhattanApartments in QueensApartments in Staten Island

2-bedroom apartments

2-bedroom apartments in Bronx2-bedroom apartments in Brooklyn2-bedroom apartments in Manhattan2-bedroom apartments in Queens2-bedroom apartments in Staten Island

Support

FAQContact usLive support

Legal

Terms of usePrivacy policyCommunity guidelinesAgency disclosureFair housing disclosureStandard operating procedures
© 2026 Openigloo Inc. All rights reserved.