Mike's House

Is not the same house when Katharine lives there in Season 4-5. They must of remodeled it, without mentioning it.

When Mike lived there S1-3, the downstairs was small with side stairs up against a wall and a small kitchen. In season 4-5, the wall by the stairs is gone, the front room looks bigger, the kitchen looks more like Bree's and goes into a whole other room.

In trivia I've read the downstairs of all the homes are inside those homes, but no mention of this big change.

Edit: After more "research" Mike's house was remodeled. So, that answers that.