> buy up the local infrastructure (housing, office space, coffee shops, etc), and turn around and rent / sell to the startups that you just funded. This would pad the ROI, so even a company that crashes and burns after 5 years would still be profitable on the basis of the rents paid.
You can never turn a profit on rent paid out of money you gave to someone, just like it's impossible to turn a profit on purchases your employees make from you with the wages you pay them. You're always better off just keeping the money.
That does not "pad the ROI". It lowers the ROI of the fund. It may launder some money from the fund into a VC's personal pockets, but that's not the same thing.
You can never turn a profit on rent paid out of money you gave to someone, just like it's impossible to turn a profit on purchases your employees make from you with the wages you pay them. You're always better off just keeping the money.