N.Y.C. Admin. Code § 5-359: § 5-359 Entry upon lands to make maps.

The commissioner, his or her agents, engineers, surveyors, and such other persons as may be necessary to enable him or her to perform his or her duties under this subchapter, are hereby authorized, pursuant to section four hundred four of the eminent domain procedure law, to enter upon real estate, and any land or water on or contiguous to the line, course, site or track of any pond, lake, stream, reservoir, dam, aqueduct, culverts, sluices, canals, bridges, tunnels, pumping works, blow-offs, shafts and other appurtenances for the purpose of making surveys or examinations and preparing and posting the notices required by this subchapter.