Woolworth's Department Store At 920 Main St.

[Highrise Tower]

wow!!

I never knew there were two different Woolworth's in downtown!  The original F.W. Woolworth Co. 5-10 and 15 Cent Store was located at 920 Main Street.  This building was designed by architect Alfred C. Finn.  The other building at  613 Main Street was designed by Kenneth Franzheim.

Almost every city and town of any size or importance in the United States in the first half of the twentieth century had a Woolworth’s Department Store. Houston’s downtown branch was located at 920 Main Street. The photo can be dated to 1917–1918, because during that time architect Alfred C. Finn maintained an office, visible on the left side of the second floor, in the Woolworth Building. When Woolworth store chain founder Frank W. Woolworth died in 1919, there were over one thousand Woolworth stores in the United States alone.

[EspersonBuildings]

I think you have the locations reversed.  I believe the original store was in the 600 block of Main (the picture) and the 900 block of Main was the later location designed by Kenneth Franzheim.