not sure it’s gas if it originated at LA fitness. what do they have gas run to? could be a pool and/or hot tubs but I think those are electric.
They said it was a vacant restaurant that exploded, per local reports. Plenty of gas lines/appliances to be found there. I have relatives in FL and it is very common for residential houses to have natural gas for hot water, dryers and cooking with pool heaters and generators common items as well. They normally use heat pumps for any building heating in the cooler months.
A place like LA fitness would probably use gas for hot water and backup generators if equipped.