Like many U.S. cities, Philadelphia and Pittsburgh have seen a boost in real estate development that will create more favorable tenant conditions in the next 12 to 18 months, according to a new report. While some law firms are likely to move into the most premium spaces, firms outside the top tier will benefit as increased competition slows rent growth.

JLL’s 2017 Law Firm Perspective report, released Thursday, said both Philadelphia and Pittsburgh are in a landlord-friendly phase, but that will shift to neutral in 2018 and tenant-favorable in 2019.