Was there property there that they had to confiscate? I don't recall any homes or small businesses around there, only lots and lots of parking.
I went to see the Ballpark at Arlington a few years ago on a non-game day. There were quite a few parking lots and open space. It didn't seem like a very congested area of town.
On the contrary, when they built the baseball and football stadiums in Pittsburgh, they used "eminent domain" to raze several apartment buildings, houses and businesses that were not vacant. Some of these people had been living there for decades.