This is surprisingly common. Infrastructure projects that sometimes include arenas, convention centers, etc are built using economic development funds, then sold for far less than they cost to build. The reality is that they would never make back the money they cost to build, so private financers can't back such projects, but when such facilities are available they represent a significant investment in the community and the nearby businesses, mostly hospitality (food, hotel, entertainment), reap huge benefits. This attracts more businesses, workers, consumers, etc and economic projects generally suggest that the facilities will be worth the perceived loss.
It's the same for the superbowl, world cup, and the olympics.
The government doesn't really want to be in the business of business - be it a convention center or an apartment building - but handing it off for private usage usually includes significant contract terms, up to and including the project can't be resold without government approval, redeveloped into something different, must be available on an equal opportunity basis, etc, etc, etc.
It's really not much different than any other development program, but rather than tax incentives and breaks, or grants or guaranteed loans, they are selling buildings and infrastructure. It's part of the plan, even though it does seem a little shady to be giving a business entity something for a fraction of its worth cost.
It's not even like he's trying to brag or something, but that his view of all events and situations zeroes back to himself.
