In designing the 28th Street Apartments in South Los Angeles, architects at KoningEizenberg had several underlying missions: To restore an 80-year-old structure, to add a new residential wing, and to modernize the entire complex, making it more sustainable. In sunny L.A., adding solar energy was a no-brainer.But where exactly to add that solar is becoming an increasingly difficult question.Part of this affordable housing project is an historic 1926 YMCA originally designed by Paul Williams, the first African American to be certified as an architect west of the Mississippi. The building is a gem, both aesthetically and culturally, and it was incredibly