ANN ARBOR, MICH. — Oxford Cos. has acquired 777 East Eisenhower Parkway on Ann Arbor’s south side. The purchase price was $29.5 million, according to local media reports. The office building spans 10 stories and 290,000 square feet. Oxford will all retain all leasing and property management services for the asset. Tenants include a mix of financial, technology, legal and health companies. Oxford plans to invest $10 million in building improvements, including renovations to the first floor. The seller was not disclosed.