This waterfront construction work permit is required when building or renovating any structure on City-owned waterfront property. It is also required when building or renovating piers, bulkheads, seawalls or docks on privately-owned property.
The details of the permitting process are here.
NYC Department of Small Business Services (SBS)
Waterfront Permits Unit
1 Liberty Plaza, 11th Floor
New York, NY 10006
For further assistance, please call 311 and ask for: SBS Waterfront Permits Unit