Wren House, an infrastructure investment management company, agreed to acquire a minority stake in Blackstone-backed Phoenix Tower International, a firm that owns and operates wireless infrastructure sites, for $500m. "We are excited to add Wren House to our long-term partnership with Blackstone and look forward to benefiting from their investment experience. We believe that there is significant opportunity in the wireless infrastructure sector and are confident that with the support of the Wren House and Blackstone teams, PTI will continue to execute on its strategic growth priorities," Dagan T. Kasavana, PTI Founder and CEO.