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Entity
Oak Hill Advisors
Tenant
MANHATTAN · 3
1 building
3
Total Filings
3
Projects on File
1
Buildings Worked
0
Projects w/ Open Permits
Tenant
Primary Trade
Activity
Projects by first filing month3 projects all-time
0123Jun '20 · 1May '21 · 2Jun '20Aug '20Oct '20Dec '20Feb '21Apr '21May '21
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Signed off3100%
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Alteration3
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51 EAST 42 STREETMANHATTAN · latest 05/25/2021
3 projects
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3 projects
1 projects
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2 projects
Owners
3 projects
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ProjectAddressTypeStatusFiledLatest permitOn the projectDescription
M00506058 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off05/17/202105/25/2021
Design HLW INTERNATIONAL
Owner SL GREEN REALTY CORP.
Contractor TRI-STAR CONSTRUCTION COR
Filer A1 EXPEDITING SERVICE CORP.
Mechanical modifications as per plans filed here with. No change in egress, use or occupancy.
M00506111 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off05/17/202105/20/2021
Design MG ENGINEERING D.P.C.
Owner SL GREEN REALTY CORP.
Contractor SIRINA FIRE PROT CORP
Filer A1 EXPEDITING SERVICE CORP.
SPRINKLER MODIFICATIONS ON THE 11th FLOOR (MARKETING/TENANT FLOOR 16) AS PER PLANS FILED HEREWITH. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
M00333703 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off06/11/202006/23/2020
Design MG ENGINEERING D.P.C.
Owner SL GREEN REALTY CORP.
Contractor PACE PLUMBING CORP
Filer A1 EXPEDITING SERVICE CORP.
Plumbing & Sprinkler modifications as per plans filed here with. No change in egress, use or occupancy.
Counts cover all 3 projects (3 DOB NOW). Dated by first filing; BIS projects by first permit issuance.
Who this entity's projects were filed with. Top 25 per group by shared jobs.
NameProjects togetherMost recent
MG ENGINEERING D.P.C.305/21/2021
HLW INTERNATIONAL105/21/2021
Who this entity's projects were filed with. Top 25 per group by shared jobs.
NameProjects togetherMost recent
PACE PLUMBING CORP102/11/2021
SIRINA FIRE PROT CORP105/17/2021
TRI-STAR CONSTRUCTION COR105/21/2021
Who this entity's projects were filed with. Top 25 per group by shared jobs.
NameProjects togetherMost recent
SL GREEN REALTY CORP305/21/2021
Who this entity's projects were filed with. Top 25 per group by shared jobs.
NameProjects togetherMost recent
A1 EXPEDITING SERVICE CORP.205/21/2021
3 DOB NOW projects, anchored the same way as Buildings Worked. Status is the project's permit state today: open = at least one permit currently issued. BIS projects show their raw permit status and are not counted as open.
All 3Signed off 3
3 projects
ProjectAddressTypeStatusFiledLatest permitOn the projectDescription
M00506058 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off05/17/202105/25/2021
Design HLW INTERNATIONAL
Owner SL GREEN REALTY CORP.
Contractor TRI-STAR CONSTRUCTION COR
Filer A1 EXPEDITING SERVICE CORP.
Mechanical modifications as per plans filed here with. No change in egress, use or occupancy.
M00506111 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off05/17/202105/20/2021
Design MG ENGINEERING D.P.C.
Owner SL GREEN REALTY CORP.
Contractor SIRINA FIRE PROT CORP
Filer A1 EXPEDITING SERVICE CORP.
SPRINKLER MODIFICATIONS ON THE 11th FLOOR (MARKETING/TENANT FLOOR 16) AS PER PLANS FILED HEREWITH. NO CHANGE TO USE, EGRESS OR OCCUPANCY.
M00333703 ↗51 EAST 42 STREET
MANHATTAN
AlterationSigned-off06/11/202006/23/2020
Design MG ENGINEERING D.P.C.
Owner SL GREEN REALTY CORP.
Contractor PACE PLUMBING CORP
Filer A1 EXPEDITING SERVICE CORP.
Plumbing & Sprinkler modifications as per plans filed here with. No change in egress, use or occupancy.
Click a row for this entity's own projects, plans and documents at that building.
BuildingFilingsMost Recent
51 EAST 42 STREET ↗305/21/2021
▾Documents — 33 on file (BIS + DOB NOW)
▸Plans & Drawings8
▸DOB NOWPlans/Sketch3
09/03/2026M00506111-I1 · 51 EAST 42 STREETRequest digital key ↗
09/03/2026M00506058-S1 · 51 EAST 42 STREETRequest digital key ↗
09/03/2026M00506058-I1 · 51 EAST 42 STREETRequest digital key ↗
▸DOB NOWPlans/Sketch - Plumbing3
09/04/2026M00333703-I1 · 51 EAST 42 STREETRequest digital key ↗
09/04/2026M00333703-I1 · 51 EAST 42 STREETRequest digital key ↗
08/15/2026M00333703-P1 · 51 EAST 42 STREETRequest digital key ↗
▸DOB NOWPlans/Sketch - Sprinkler2
09/04/2026M00333703-I1 · 51 EAST 42 STREETRequest digital key ↗
08/15/2026M00333703-P1 · 51 EAST 42 STREETRequest digital key ↗
▸Seals & Professional Certifications15
▸DOB NOWSpecial Inspector Seal & Signature7
09/23/2026M00333703-I1 · 51 EAST 42 STREETOpen ↗
09/23/2026M00333703-I1 · 51 EAST 42 STREETOpen ↗
09/02/2026M00506058-I1 · 51 EAST 42 STREETOpen ↗
Showing 3 of 7 on file for this type
▸DOB NOWDPL-1: Design Professional Seal & Signature5
08/13/2026M00333703-I1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506111-I1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506058-I1 · 51 EAST 42 STREETOpen ↗
Showing 3 of 5 on file for this type
▸DOB NOWProgress Inspector Seal & Signature3
09/02/2026M00506058-I1 · 51 EAST 42 STREETOpen ↗
08/26/2026M00506058-S1 · 51 EAST 42 STREETOpen ↗
08/26/2026M00506058-S1 · 51 EAST 42 STREETOpen ↗
▸Environmental & Asbestos9
▸DOB NOWOER: Notice to Proceed5
08/13/2026M00333703-I1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506058-S1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506111-I1 · 51 EAST 42 STREETOpen ↗
Showing 3 of 5 on file for this type
▸DOB NOWOER: Notice of Satisfaction4
08/13/2026M00333703-I1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506058-S1 · 51 EAST 42 STREETOpen ↗
08/13/2026M00506058-I1 · 51 EAST 42 STREETOpen ↗
Showing 3 of 4 on file for this type
▸Energy Compliance1
▸DOB NOWEN2: As Built Energy Analysis.1
08/13/2026M00506058-S1 · 51 EAST 42 STREETOpen ↗