I want to add this -

In a neighborhood a friend of mine bought a home in, medium 3-bedroom ranches
with a full basement and 1 bath, EIK, dining room & 1 car garages, all on or
about 1/3 acre lots, homes were (at the time) going for about 175,000.- give or
take depending on improvements (some homes had original windows, boilers,
kitchens, baths, etc, and some have replaces some or all of these items)

There was, in this subdivision 2 homes which "McMansioned" - One added a huge
2-story addition, a master bedroom suite with bath, walk-in closets on 2nd fl
and a den and 1/2 bath on the first... and another turned the ranch into a
2-story ranch practically a 2 family home (though not legal.)

Both of those homes sold recently for only about 20% more than the originals
sell for.