CSGP ▼ -1.7% - CoStar Group, Inc. $CSGP - Apartments.com Releases Multifamily Rent Growth Report for August 2026 CoStar Group's Apartments.com division released its monthly multifamily rent growth report for August 2026, a routine data publication that tracks rental trends across the U.S. apartment market. The stock declined 1.7% today, though the headline provides no specific data or market-moving findings from the report itself. 02-SEP-2026 04:19 PM ET