Apartment building on 5th Avenue.

[800 Park Avenue.]

[800 Park Avenue.]

[800 Park Avenue.]

[800 Park Avenue.]

[800 Park Avenue.]

[800 Park Avenue.]

Apartment building on 5th Avenue.

[800 Park Avenue.]

[800 Park Avenue.]

[381 Park Avenue.]

Apartment building on 5th Avenue.

[381 Park Avenue at 53rd Street.]

Room inside the house of William C. Whitney.

Bench inside the house of William C. Whitney.

[Architectural rendering of 800 Park Avenue.]

[Architectural rendering of 800 Park Avenue.]

[Architectural rendering of 800 Park Avenue.]

Room inside house of William C. Whitney.

Room inside the house of William C. Whitney.