Architect Jeffrey Tohl has transformed his yard in Studio City, Calif., into an outdoor living room and multilevel garden. Tohl, however, had to work around a steep, sloped hillside so he installed a scoured concrete terrace just outside the home's top floor and a series of terraced gardens rise behind the 16-foot retaining wall. He also put in raised planters to keep his dog Maggie from digging around plant roots.

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