A starting janitor/furniture mover/relief doorman at the building where my office is makes more than a 5 year FO at any regional and the benefits are better, time off is better. They just don't have a carrot they are chasing.
If these building management companies were smart they would take the few at the top and pay them a bunch of money. Then they could get the rest to work at half of what they are making now as they chase that carrot. Log book - Desks fit into an elevator, furnace igniter failures diagnosed and replaced. Build your resume to where your are allowed to put the big desks into the big elevators.
They could create an excitement by talking about how many maintenance people are reaching retirement age and how these high paying jobs will be available to those who have paid their dues and logged so much time.
If the janitors/furniture movers/relief doorman won't work for the 16000 a year they can go to the government and complain about the shortage of qualified people for these jobs. We could get the government to setup training programs for these jobs. They could advertise how these jobs are now paying more than an airline pilot makes because of the severe shortage.