While the market is booming with sales, other fundamentals, including vacancy, are weakening.

September rents slipped slightly, but the decline was milder than in the prior two years and annual growth accelerated to 1.5%.

Boomers' decisions to renovate and remain in their homes are keeping more family-sized properties off the market.

Energy savings are growing in major markets, while corporate real estate teams lag in preparedness and building performance requirements tighten.