This is also extremely true!
Those AI servers are probably a discounted cost of around 3-5k per U (I'm probably low in this estimate but I have a really hard time believing they're actually paying $20k+ per GPU), probably about 40U per rack is actually loaded with servers, so if we round the footprint of a server rack to 4 square feet (because I don't feel like actually calculating it out right now) that's about $30,000-50,000 per square foot.
I have a hard time imagining any kind of structure costing anywhere near 1 order of magnitude less than the cost per square foot of the servers