Real estate was a term that encompassed land and what was built on it. It was also extended to tracts of space and improvements on space, such as starbases. In most cultures, real estate was somewhat associated to banking.
The students of Aldanna University, on Malachor V, went on strike in 2401 not only to protest against the tuition hike but to protest against the mismanagement of their school, including real estate projects. (Star Trek: The Stoneship Files: "The Defector")