21 MONITOR STREET
21 MONITOR STREET is a Class C1 (walk-up, over six families) building in Brooklyn (BBL 3028320012) built in 1920, with 15 residential units across 3 floors.
The building is in NYC community district 301, council district 34, zoning district R6B, on a 5,000-square-foot lot with a building footprint of 9,600 square feet.
The current registered owner of record per NYC PLUTO is ST CECILIAS RC CH.
MetroDeeds shows no confirmed ACRIS deed transfer for this BBL in the last 5 years of recorded NYC public-records data.
The building is registered with NYC HPD's landlord-registration system and has no open HPD housing-maintenance code violations on record as of May 18, 2026.
Data sourced daily from NYC PLUTO (Department of City Planning), NYC ACRIS (Department of Finance), and NYC HPD housing-maintenance code violations.
Owner of record
HPD registered contacts
- Head OfficerMordechai Landau
- Corporate OwnerSEVENTEEN MONITOR LLC
- Site ManagerJack Basch
Most recent deed
Recent ACRIS documents (last 1)
Building stats
- Zoning:
- R6B
- Lot size:
- 5,000 sqft
- Building area:
- 9,600 sqft
- Floors:
- 3
- Assessed value:
- $1.1M
- Community district:
- 301
- Council district:
- 34
HPD violations
Recent HPD violation details
- Class AInspected Mar 24, 2023(A) § HMC:FILE ANNUAL BEDBUG REPORT IN ACCORDANCE WITH HPD RULE AS DESCRIBED ON THE BACK OF THIS NOTICE OF VIOLATION OR AS DESCRIBED ON HPD…
Recent ACRIS activity
Frequently asked questions about 21 MONITOR STREET
Who owns 21 MONITOR STREET?
The current registered owner of record for 21 MONITOR STREET per NYC PLUTO is ST CECILIAS RC CH. MetroDeeds shows no confirmed ACRIS deed transfer for this BBL in the last 5 years of recorded NYC public-records data.
When was 21 MONITOR STREET last sold?
MetroDeeds shows no confirmed ACRIS deed transfer for 21 MONITOR STREET in the last 5 years of recorded NYC public-records data. NYC ACRIS coverage extends back to 1966; an absence in our 5-year window typically means either the BBL has not transacted recently, or the most recent recorded document is not a DEED type (such as a refinance rather than a sale).
How many HPD violations does 21 MONITOR STREET have?
No open HPD housing-maintenance code violations are on record for 21 MONITOR STREET as of May 18, 2026. The building is registered with NYC HPD's landlord-registration system. HPD violation data is pulled daily from the NYC Open Data violations feed.
What is the assessed value of 21 MONITOR STREET?
NYC Department of Finance assesses 21 MONITOR STREET at $1.14M for the current tax year. NYC assesses property at a fraction of estimated market value (the assessment ratio varies by tax class — 6% for tax class 1 one-to-three-family dwellings, approximately 45% for tax class 2 rental apartment buildings), so the market value implied by this assessment is meaningfully higher. Assessment data is published by NYC Department of Finance.
What building class is 21 MONITOR STREET and what does that mean?
21 MONITOR STREET is NYC building class C1 — Walk-up, over six families. A 3-to-6-story walk-up apartment building with more than 6 residential units. Building class is assigned by NYC Department of Finance and recorded in PLUTO; it determines the property's tax class and the regulatory regime that applies.