321 Central St., LLC has purchased 321 Central St., for $3.225 million or $71 per s/f.   The 46,000 s/f building located off I-495 was fully leased to two tenants. The seller, Central Street, LLC, was represented by Eric O'Brien, president of O'Brien Commercial Props, Inc. and David Stubblebine and James Stubblebine of The Stubblebine Co. The buyer was represented by Jim Grady from NAI Hunneman. O'Brien Comm'l. will continue to manage the property.