“A split foyer is a fascinating challenge,” said Durosko. “For starters, you have to eliminate the mid-level front-facing stairwell, and create alternatives that really advance the owner’s vision.

With six kids, a housekeeper named Alice and Tiger the dog, the fictitious “Brady Bunch” of the 1970s sitcom filmed in a real-life mid-century California house, a perfectly groovy set for all the ...