Thanks to its desert locale and legendary trove of mid-20th-century butterfly roofs, breezeways, and boomerang pools, Palm Springs routinely gets tagged as a modernist “mecca.” Likewise, many a vintage garden there suggests an “oasis” of putting green turf, Technicolor flowers, and bottomless reservoirs. A 1956 version of that magic lives on at the former estate of the Broadway and Hollywood composer Frederick Loewe (My Fair Lady, Camelot, Gigi), now a rental getaway and events venue owned by Chicago entrepreneurs. But when the couple decided to build a family vacation home on a lot next door—originally Loewe’s three hole golf course—they sought a 21st-century modern alternative to retro showmanship.