That's the 1969 address of Burgerville.
The above photo accompanies the article, "State Street: It Could Be a Great Street" in the July 9, 1969, edition of the Capital Times. (Found in the "Streets to Synagogues" drawer of the Madison Central Library clippings files.)
Address verified in the 1970 Madison City Directory.
At 670, a State Street Stalwart.
Caribou Coffee now occupies the space at 652 State Street.
Photo by Retiring Guy
Other Madison Then and Now posts:
City-County Building. (9/1/2015)
Veterans Administration Hospital. (8/27/2015)
The Red Gym: When will the unobstructed view return? ()7/22/2015)
UW-Madison College of Agriculture. (7/22/2015)
Wisconsin State Historical Society. (7/21/2015)
UW-Madison Memorial Union. (7/21/2015)
240 West Gilman. (9/6/2013)
North Carroll Street between West Johnson and West Gorham. (9/5/2013)
East Mifflin & North Pinckney. (8/30/2013)