See, this is one more way the children-of-boomers generation is getting screwed: Your neighbor has added on to get the space she needs to take care of her family, but in doing so, she's set herself up to lose money when she sells the house. The biggest house in the neighborhood always sells for less (less per square foot, that is) than the rest of the neighborhood -- it's "overbuilt" for the area.Our neighbor down the street did this. They added onto their house. Now, their house is the biggest in the neighborhood. Four car garage, they added housing on top of both garages and added onto the back with a 3 season deck/room. They have alot of people living their, it seems crowded at times, but I believe they needed that extra room for their sanity. I think the daughter has 4 kids and then the grandparents.
Looking at the house as an investment, you always want to own the smallest house in the nicest neighborhood -- that sets you up for a good sale price.
However, she probably had no good choices.