@kegnkiwi
Pace are no longer in existence, they were merged with another company and the joint venture was subsequently acquired by Commscope.
The big dish and the smaller 1.2m dishes might be redundant and available?
If you are serious about the big dish you could ask the building manager if anyone in the building is using it?
If it is no longer in use they might simply let you dismantle it and take it away free of charge or for a nominal sum?
If they agree in principle to letting you have the dish you might need to provide a "statement of works" outlining your proposed plan of action for dismantling it to comply with health and safety regulations.
I have had to do this in the past when dismantling and removing large dishes of similar size from corporate sites.