It’s impossible to time the market, so it makes sense to buy at the right price relative to current markets. If you don’t stay active, you can miss out on great opportunities. It also makes sense to hold for long periods of time, because five years or less is often not enough time to expect precise execution of a business plan given the vagaries that are entailed. Peter Linneman, Principal of Linneman Associates, is a prolific multi-decade investor and founder of Wharton's Real Estate Department and the Zell-Lurie Real Estate Center. Peter Is bullish on Multifamily, despite short term headwinds in many markets.