If you are deep into a franchise, it would be cool to be able to build a new stadium once in a while. I wouldn't get too crazy with it, just several modular pieces that could be slapped together in your preferred setup. Want a cavernous outfield with a green monster and no room in foul ground? You got it. How about a band box with a city skyline view or a retractable roof with a pool?
If you really want to get creative, you could make the player have to take money of his budget to pay for it for the next 20 years. You could also sell naming rights to fictional companies to help offset the cost. Each modular section could have a cost attached to it...the fancier the section, the more it costs. Remember how I said not to get too crazy with it?
