Wealthy homeowners are making space to take sports and hobbies to a new level.

Indoor putting greens have become common, along with multi-purpose activity rooms.

"Parents are adding rooms to a home with surfaces that lend themselves to tennis, basketball, gymnastics and other activities," said Forman.

King added he recently saw a three-level, 20,000 square foot home with an entire floor dedicated to music with a band stage and seating for a 40-person crowd.