Steve Schwarzman’s Blackstone Inc. paved the way for private equity firms to pitch the everyday millionaire. Now, a flight of money from some of the industry’s retail funds is inviting scrutiny. The $68 billion Blackstone Real Estate Income Trust has been grappling with an increase in investors pulling money, particularly from Asia. Rival Starwood Real Estate Income Trust has also seen an uptick in withdrawal requests. In recent weeks, both of the real estate trusts limited redemptions.