We've completely gutted the inside (up to the studs and rafters) of our 1945 1660 sf bungalow... we have two bathrooms, turned two bedrooms into one, and the other bedroom into a good-sized tv room. We removed the walls between the dining room and kitchen, and those rooms and the living room to make one 600 sf open area with all three rooms still defined.
I have one bathroom left to do, mainly because we are still deciding... it takes a while to get a consensus around here sometimes! I want a floating toilet and sink, for starters, though

Love 'em!
Aside from that, I have outdoor improvements to do... 100' long drive needs to be redone (it's asphalt), our 35' concrete walkway needs redoing, our concrete and wood deck needs an overhaul, and we have a wooden 'walkway' around the exterior of the ocean side of our house that is a complete mess... So, we're still talking $75 grand... oh, and we need to paint and get proper lighting for the exterior.
It never ends, does it? sigh.