Exterior of seniors housing community Orchard Heights in Clermont, FL, one of 55 seniors housing properties currently operated by Hawthorn.

SEATTLE—Columbia Pacific Advisors said Monday that it would acquire Hawthorn Retirement Group, an owner/operator of seniors housing with 55 communities in operation and another 24 under development. Deal terms were not disclosed; Columbia Pacific recently partnered with Blackstone on a 64-property portfolio leased to Brookdale Senior Living in a $1.125-billion acquisition.