Trivia question. What real house has been used in the most episodes?...

[Rabblevox]

I noticed recently that "Kyle/XY" and "Millenium" were both shot around the same house. (A beautiful 1920's craftsman-style, probably located in Seattle's Queen Anne neighborhood).

It got me wondering, what real houses have been used the most in TV? My initial guess is that "Magnum, P.I." would take the crown for a single show, but that's just a guess.

But what about houses that have been used in multiple series? Anyone got a clue? (or an idea how to parse it for a google search?)