I’ve heard about these things.
McMansion
noun
Mc· Man· sion mək-ˈman(t)-shən
A very large house built in usually a suburban neighborhood or development
especially : one regarded critically as oversized and ostentatious
“12900 Aden Rd is a 6,476 square foot house on a 10 acre lot with 4 bedrooms and 5 bathrooms.. Based on Redfin’s Nokesville data, we estimate the home’s value is $1,303,606.”