Mark,Joe,
I was looking for the manse on google street views, but you can't see much behind the shrubbery. I did find that Mary Thomson was originally married to one of the Wannamakers before she wed Archibald Thomson, a doctor. They were fairly well off as they listed a few maids, cooks, handymen, etc., as living on their estate.
Archibald was a member of the Philadelphia Club, The Philadelphia Country Club, The Racquet Club, and The Radnor Hunt Club.