Having lived in, and loved, a modern house built in 1954 in Seattle’s Magnolia neighborhood since buying it in 1996, architect Karen Braitmayer and her husband, marine mechanic David Erskine, recently came to realize that the house was overdue for some modifications. Braitmayer, whose firm, Studio Pacifica, specializes in universal access space planning and ADA compliance for commercial and residential projects, is a wheelchair user, as is her and Erskine’s teenage daughter.