In this case, I took a color photo of the Former Jewish Hospital up on Central Park West about 104th Street as  I remember , which has now been turned into luxury condos-- very posh-- with an elegant courtyard and a fountain and Lamborghinis parked near it.

I tried to re-imagine it as an old sepia photo of the Hospital as it might have been when it was fairly new. This meant getting rid of anything in the photo that would distract from the impression that it came from an earlier  time. The whiting out around the hospital happened naturally because of the position of sun, but there is a modern tall condo building directly behind the Hospital which I eliminated, as well as modern  street signs of various kinds.

Oh, here is a shot from a different angle of the Hospital now-