“The result is a streamlined ratio of exhibition to ancillary space, something increasingly rare in an age of museum bloat. The Broad has 50,000 square feet of gallery space — 35,000 on the third floor and 15,000 more on the first — in a building totaling 120,000 square feet. Renzo Piano’s new Whitney Museum in New York has the same amount of interior exhibition space in a building covering 220,000 square feet.”