John Manley with Long Range Planning provided me with the history of zoning on these parcels.
The Northern portion (parking lot, Dairy Queen, Blairco) was annexed to the city 12/31/49. It was zoned B-1 until 1967. Allowed grocery, personal services, retail 5,000sf or under, cafe as limited use and less than 1,000sf, 20' max building height. John found no information during the 70's; 12/7/81 this portion was shown as CC, with updated codes that allowed 50' height.
The Southern portion, which includes the existing commercial space and where the old grocery stood (currently Garden in the Heights) was county code CL - Local Community - which called for a setback formula for each foot over 20'. This portion of the parcel was annexed at the request of the owner of the property 10/1/1994. The City applied the CC code, which was consistant with the adjacent property and with what was currently occupying the space.