When it comes to utility systems, in this case in the south, and double digit temps below freezing for several days, if the building codes allow for the lowest common denominator for emergency infrastructure regarding building costs, maybe this is what happened.

Maybe losing a downtown high rise during sub freezing multi-day event would be vastly more expensive than an apartment unit or single home in damage to property. The high rise owner/operators would be fools if they depended on regulators like those experts(?) in Texas. I'm not trying to dis living units, we saw some larger apartment units with lots of floors leaking water and damage all down through the structures, they better have some unbelievable insurance coverage. Which reminds me, knowing who is regulating energy in Texas, downtown high rise building owners would never be able to afford liability/damage insurance if they had not already secured a power backup program of infrastructure, yep the lights stay on or else massive FUBAR, even downtown.