For perspective on how big 55,000 acres is, 640 per square mile, is 86 square miles, enough land to hold the city limits of Choose 2 of 3: Paris, Barcelona, and San Francisco.
Paris city limits, 2.1 million residents, 41 square miles
Barcelona city limits, 1.6 million residents, 39 square miles
San Francisco city, 800k residents, 47 square miles
I’m not sure about Barcelona but San Francisco is pretty much like Paris in that way (just way leas dense).
It’s really not a fair comparison.
If they're going to just build another The Woodlands (x2, they have twice this much land too) this isn't a very ambitious and transformative project, it's just a big fancy housing development with a Mayor and City Council instead of an HOA.
So I'm not sure you can compare areas with radically different density. If I got all the debates about US zoning and building sensibilities right, then it's very unlikely they'll try to build high-density apartment blocks there like in Barcelona or Paris.