Aggieland Flowers & Gifts (at one time, at least according to directories, "Aggieland Flowers & Gift Shoppe") has been in the 1965-built 209 University from before 1980 to around 2007, when it moved to the bypass as Aggieland Flowers & Chocolates. After a few years of being empty, it was replaced with The Ranch, which replaced the roof with an upper level area. What I'm not sure about is as of 2012, was the upper level of The Ranch part of The Ranch or was it Schotzi's SkyBarr/Sky Bar as described in the previous post 4.0 & Gone? Furthermore, there's evidence that The Ranch was filed in New Development files as "Aquarium Bar", but it never opened as such.
The conversion to The Ranch came about the time when on-street parking was removed in favor of a wider sidewalk. Sometime by 2015, The Ranch closed and became The 12 Rooftop Bar & Lounge.
UPDATE 01-03-21: As part of integrations with the University Drive "City Directory" page (still in its original form as this writing), Aggieland Flowers has been at this site since at least 1972.