The guys that had the Big Big houses were the associates that they extorted' cos most had big businesses that they could prove to the IRS that they paid for with good money.
The gangsters really did not live in big homes,look at Nino from the Gambinos he made big money and lived in a row home.
Now the Persico's Lil Allie boy had a nice house in BK and upstate his uncle Allie boy had a row home but had a monster on the farm upstate,Carmine had row home and a monster in BK and a big mansion on the farm upstate.Teddy his brother had a modest house on Long Island but has a nice house on the farm.
Michael has it all ! !