You are probably right, because I was thinking Mac owned it too, briefly during one of his divorces from Rachel. Wow, that house really got around. Undoubtedly holds AW's record for house owned by the most different characters.
I remember when Walter and Lenore moved into Bill and Missy Matthews' former house, and I thought that was a big deal. Later, Lenore lived in the same house with Robert Delany. That was the house with the sunken living room.
Was that where Cass was living after Cecile left in 1984, until she sent an emissary to evict him in early 1985? he AWHP has an address for that place as 30 Meadow Lane. (Not that addresses are mentioned often enough to be sure whether there is accurate continuity.)