Why no taco stands in midtown

I can rattle off at least several parking lots that are almost always empty by 5 pm, especially Friday-Sunday. Is the enforcement stricter in midtown? Are brick and mortars complicit or encouraging the enforcement? Taco stands are just such a part of sac’s identity and I hate having to go to south sac or over the river north to find a tent with a glistening trompo adorned with a pineapple crown to stop at.