850 10th Avenue, Manhattan
School · built c. 1924 · Block 1065, Lot 1.
Building permits
- Alteration, filed Oct 6, 2026, estimated cost $90K, described as “Installation of new supplemental cooling split ac system in two classrooms on 4TH floor.”
- Alteration, filed Aug 5, 2026, estimated cost $50K, described as “Propose to remove and install interior non-bearing partitions as per plans filed herewith. No change in use egress or occupancy is proposed under this application.”
- Alteration, filed Jun 3, 2026, estimated cost $313K, described as “Facade and roof repairs as per plans filed herewith. No change to use, egress, or occupancy.”
- Alteration, filed Mar 3, 2025, estimated cost $56K, described as “M834-High School for Environmental Studies: Interior conversion of an existing classroom with two closets to a culinary arts classroom with two storage rooms.”
- Alteration, filed Dec 28, 2022, estimated cost $10K, described as “Installation of debris chute at 444 west 56TH street, manhattan as per indicated on plans. There will be no change in the use, egress, or occupancy under this application.”
- Alteration, filed Dec 28, 2022, estimated cost $10K, described as “Installation of new sidewalk shed at 444 west 56TH street, manhattan as indicated on plans. There will be no change in the use, egress, or occupancy under this application.”
- Alteration, filed Dec 28, 2022, estimated cost $10K, described as “Installation of pipe scaffold at 444 west 56TH street, manhattan as indicated on plans. There will be no change in the use, egress, or occupancy under this application.”
- Alteration, filed Dec 28, 2022, estimated cost $10K, described as “Installation of temporary construction fence at 444 west 56TH street, manhattan as indicated on plans. There will be no change in the use, egress, or occupancy under this application.”
- Alteration, filed Sep 30, 2022, estimated cost $76K, described as “Providing new floor drains and in-kind replacement of sump pump in the boiler pit in the boiler room. The work also includes other boiler associated demolition and new plumbing piping work.”
- Alteration, filed Sep 30, 2022, estimated cost $2.9M, described as “Demolish and replace the existing oil#4 boiler burners with new sustainable oil#2/ B20/ B100. In-kind replacement of boiler auxiliary equipment with new.”
- Alteration, filed Sep 30, 2022, estimated cost $104K, described as “Repair of deteriorated concrete elements. Adding a steel catwalk to access new boilers. Replacing deteriorated steel pipe railing.”
- Alteration, filed Sep 30, 2022, estimated cost $101K, described as “M834, D020891, HS for Environmental Studies, Climate Control/Boiler Conversion”
- Alteration, filed Sep 29, 2022, estimated cost $10K, described as “In-kind replacement of two (2) combustion air intake fans for the boilers. Replace existing”
- Alteration, filed Jun 22, 2022, estimated cost $309K, described as “Facade Restoration: Replacement of brick, steel lintels and window sills, repointing of brick and stone mortar joints, stucco replacement, concrete repairs and sealant replacement as per plans. No change to use, egress or occupancy.”
- Alteration, filed Jun 2, 2022, described as “Installation of temporary pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed Apr 13, 2022, estimated cost $1.5M, described as “Remove & replace roof assembly & misc const elements, exist chain link fence w/lockable gate. Install parapet railing. provide flashing around exist equip to remain. Ceiling tile replac. Replace exist metal door frames. Provide wall…”
- Alteration, filed Dec 7, 2021, estimated cost $109K, described as “Upgrade elevator machine rooms - providing fire-rated enclosure, access stairs, air conditioning system and new lighting.”
- Alteration, filed May 21, 2021, estimated cost $35K, described as “Installation of new structural steel beam on the 2nd Floor to support slab edge. Reinforce existing spandrel beam with MC10X33.6 each side of web on 2nd Floor as per plans (Related to Facade Restoration.) No change to use, egress or…”
- Alteration, filed Jan 20, 2020, described as “Installation of pipe scaffold as per plans. No change in use, egress or occupancy.”
- Alteration, filed Nov 12, 2019, described as “Installation of sidewalk shed as per plans. No change in use, egress or occupancy.”
- No Work, filed Sep 5, 2019
Property taxes
- Assessment
- $11,936,700
- 2026–27 tax
- $1,234,859
- Market value (city estimate)
- $26,526,000
- Taxable value
- $11,383,290
- Assessed land
- $3,937,500
- Assessed improvements
- $7,999,200
Zoning
C6-2: floor area ratio 4.04 built, 6.02 allowed by base zoning.
Flood zone
Current FEMA flood map: zone X, minimal flood hazard.
Landmarks
Part of Mission of the Immaculate Virgin (Individual Landmark). 4 Landmarks Preservation Commission permits are on file.