Nestled between high-rise condominiums on Alki Avenue in Seattle, a pair of attention-grabbing houses peeks out from the surrounding gray. Randie Stone’s famous Flower Houses are a favorite with locals and a dramatic draw for tourists. Built in 1914, the houses have withstood the test of time—and the inevitability of urban development—in this popular West Seattle neighborhood. Stone purchased the houses in 1989 after moving from Hawaii, and credits the islands as inspiration for her homes’ colorful outdoor bounty. Red, purple, and pink blooms riot among the emerald green that…