Investors worry they’ll have a tougher time generating returns in a changing environment. : Private equity real estate investment activity may slow down in the next 12 months, according to a recent report from London-based research firm Preqin. That’s largely because a significant number of the investors surveyed by Preqin—33 percent—believe the sector will perform worse in 2019 than it did in 2018, which was a record year for both the number and value of deals announced and closed at $325 billion.