I detect an underlying assumption that owning a greenscreen studio space is an automatic money machine as in, “build it, and they will come”.
There is no logical reason to believe such a thing will happen, just because you have a space. You’ll still have to market it, and find ways to generate revenue to pay the monthly upkeep and utilities and mortgage. A greenscreen shoot might only take a half-day to a day. What pays the bills the other 28 days a month? Raves and resale markets? Car storage?
Location scouts and directors/producers can be quite fickle as to where they want to work, and, they have numerous logistical concerns that dovetail into their decision-making process. Ideally, what you want to do is locate the facility near some other existing production companies, ones who are doing series TV, so that you have a consortium of nearby customers for several years/seasons at a time.
Based on the kind of questions you’re asking, you’re not IMO ready to go forward with this idea yet. You have a lot more research and planning to do first.