San Francisco couple Jim and Noriko hired acclaimed architect Anne Fougeron, founder of the eponymous local firm, to reimagine their 1901 row house in Noe Valley within the confines of historical preservation mandates. The architect tied the three levels of the 1,540-square-foot dwelling together with a perforated-steel staircase in Benjamin Moore’s Flame color. The geometric, tomato-red stairs emphasize the home’s verticality and open up what had previously been a dark interior with low ceilings.