If a business has 30.06/.07 signs posted, but no 30.05, then I believe anyone legally carrying a firearm can carry in that location, even if they have an LTC. Just like an off duty LEO can carry past a 30.06 sign even if that LEO has an LTC (which they would need for the GFSZA).
In other words, I don't believe that you must always be carrying under the authority of your LTC just because you are an LTC holder.
IANAL.