Majority of the time those are land leases - my guess is any redevelopment would have to either find them a new site or incorporate them into a new development somewhere.
I personally think this site would be a great site for a small Four Seasons or Ritz - do a combo hotel and condo development somewhere the size of Utica Place next door. I think a small five star or four and a half hotel/condo building would do well. The per square foot sales in the tower next door would support something like that.
Hotel would be nice but the H&P site at 21st & Utica is better for that. I see it as all-residential with a small condo tower and luxury apartments, stepping in down in height from west to east. Something like the NorthCreek development in Denver that was entirely built over an underground garage.
It will be interesting to see if the synagogue is integrated into the development or if they just build in another location.