Just curious how burdensome is an ice plant? I remember when Seattle was a potential relocation option people said the Tacoma Dome wasn't a viable interim solution because it didn't have an ice plant. Like how hard is this to put in and maintain?
Loaded question. is the piping in the concrete floor in tact or damaged/leaking?
How old is the plant?
What refrigerant is it? If it is an older plant does it need new/more refrigerant and is that refrigerant still available or has it been outlawed? If so, the plant needs to be replaced or modified.
Depending on if the loop to the floor runs brine or glycol you could have parts of the floor circulation system that has rotted from years or sitting, pumps that are seized ect. If it was a brine system and it was drained then as soon as the oxygen hits the piping it will start rusting and corroding.
11 years ago you may have been looking at ammonia/brine systems to a lot of variables there.
The question you ask is good, but it is extremely loaded and requires a lot more information on the plant at the time it was shut down.