3220 Botanic Garden Blvd
TAD.org says the property is owned by the City of FW.
http://tad.org/search-by-property-locat ... artmentCd=
My understanding of TX law is that a City-owned location cannot be enforcibly posted 30.06 or 30.07.
This is just my OPINION. Not legal advice.
I would not hesitate to carry (concealed) there, assuming the location is the same as the one I've looked up. YMMV.
I suggest submitting the violation to the AG's office through the proper process.
ETA: before filing with the AG, you need to send a complaint to the entity (in this case FWBG) directly and give them 3 business days to remedy.
https://www.texasattorneygeneral.gov/apps/3006/