Karim Rashid's residential building on Pleasant Avenue in Manhattan, called HAP 5, broke ground in April. If New York Mayor Bill de Blasio wants affordable housing that isn’t cookie-cutter, perhaps he should consult Karim Rashid. At 53, Rashid is best known for designing household products. But now he wants to design households for those products, and he is getting his wish: among his current projects are four Manhattan condo buildings, the first of which is already under construction. Though they are recognizably Rashid’s—with ample curves and Kool-Aid colors—they are also economical, with construction costs of about $250 per square foot.