9-13 Mercer Street, site of the Museum of Holography, ca. 1978. This five-story cast iron-fronted building, erected in 1870 for the India Rubber Company, is where artists Jody Burns and Posy Jackson founded the Museum of Holography. When the Museum opened to the public on December 9, 1976, it became the world's first permanent venue for the exhibition of holograms, collection of artifacts, and education about the scientific principles and artistic applications of holographic technology. The museum closed permanently on Sunday, March 1, 1992. The building has since been leased as commercial space to advertising agencies and media companies, including the publishers of V Magazine, while its upper floors remain in residential use.

15-27 Mercer Street, ca. 1915. The building at left (nos. 15-17) are a 1886 cast iron facade loft building. Surprisingly, it is a relative newbie on this block, where 11 of the 17 buildings were constructed before 1861. No. 19 (at center with the arched windows at the third and the fifth floors) is a 1861 stone building, constructed for S.B. Althuas, who had an iron works on this same site as early as 1852.