Una Malan expands her Los Angeles footprint with a multilayered experiential showroom in a Hollywood Hills residence. Design maven Una Malan had just moved her Los Angeles furniture showroom to an airy corner on La Cienega Boulevard when she came across an available 1930s Mediterranean manse on a bougainvillea-lined residential street in the Hollywood Hills. Although her gallery was freshly open, she couldn’t resist the opportunity to create what she describes as “a collaborative and engaging…