It’s the home of Taylor Swift, Adele, Jennifer Lawrence, Jeff Bezos and any number of other celebrity grandees whose elaborate mansions, replete with helipads and cascading swimming pools, perch on some of the highest-value real estate in the world. But just having the cash to splash in Beverly Hills may no longer be enough to get yourself the latest spa basement or indoor basketball court, after a judge banned all new luxury permits for home renovations until the city first builds more affordable housing. Officials are now appealing the late-December ruling by the Los Angeles superior court judge Curtis A…