LaSalle Property Fund bought the 28-story, 510,000sqft medical office building in Houston, Texas for an undisclosed sum. : LaSalle Investment Management’s core open-end US real estate fund has added a 28-story, 510,000sqft medical office building to its portfolio. The investment manager said LaSalle Property Fund (LPF) has acquired Memorial Hermann Medical Plaza (MHMP) in Houston, Texas for an undisclosed sum. The seller is a partnership comprising Mischer Healthcare, Memorial Hermann Health System and other private investors. LaSalle said the property is currently 99% occupied and benefits from a strong anchor tenant in Memorial Hermann.