ASB Real Estate Investments and Lincoln Property Co. secured a $63 million loan for 320 and 333 Summer St., two mid-rise office buildings that total 217,000 square feet in Boston’s Seaport District.

Renovated in 2013, both feature loft-style office space that is 97 percent leased to PC data systems management firm LogMeln, which is merging into a subsidiary of Citrix.

Frederic Wittman and Brett Paulsrud of HFF’s debt placement team placed the…