BYRON, MINN. — Quantum Real Estate Advisors Inc. has arranged the sale of a freestanding medical office building located at 221 2nd Ave. SW in Byron, about 10 miles west of Rochester. The sales price was undisclosed. Bluestem Center for Autism occupies the property. Seth Gilford of Quantum represented both the seller and buyer, a South African medical acquisition fund. The seller was looking for capital to help fund expansion into new locations.