"Controlling for leverage, properties in the 25 largest markets general perform better than the norm, and assets in non-MSAs typically under-perform, often by a factor of two."
Gordon, Sally and Leslie Kizer. "U.S. CMBS Loan Performance: Impact of Seasoning, Leverage and Location on Probability of Default." Structured Finance Special Report. Moodys Investor Services. November 8, 2004.