Greenbrier Street could have been called Hamm Street.  The Theodore Hamm  Family, the founders of the Hamm's Brewery, built mansions along this street.  This gorgeous mansion at 672 Greenbrier was built in 1891 for Marie Hamm,  daughter of Theodore and Louise Hamm, and her husband, Otto Mueller. It was  designed by architect, Augustus F. Gauger, who also designed the Stutzmann  Block (7th and Bates), the Shoch Building (6th and Maria), and the Theodore  Hamm mansion which once stood across the Greenbrier Street overlooking what  now is Swede Hollow Park. 

Otto Mueller was born in Meldorn, Germany in 1856. He moved to St. Paul in 1872 after spending two years in New York. He began to work at Hamm's  Brewery, married Marie in 1892, and become vice president of the brewery in  1912. Muller's sister, Emma Mueller Claussen, was also married to an important  brewery employee, Pete Claussen. The Claussens lived at 680 Greenbrier, the  next home north. The Mueller House originally was heated by steam obtained  from the nearby brewery.

This Queen Anne is dominated by a three-story round corner tower with the uppermost story clad in fishscale shingles, tiny arched double hung windows, brackets and bead-like molding at the tower eaves, and a bell-shaped tower roof. Double-leaf doors have several small recessed panels. The south side of the house has a 2-1/2 story bay window. The north side has gorgeous semi-circular leaded glass windows edged with wood shingles and a group of three 9x9 windows topped by an elliptical-shaped transom.

The mansion had been converted into apartments through the years. The Gens have lived here for over 10 years. They have returned the home to a single-family dwelling and have completely restored the entire house.