What goes into replacing a package unit (HVAC)?
I would look into renting a “reach forklift”, or boom lift forklift, suitable for rough terrain.  They have names like Gehl, SkyTrak, JLG &amp; Genie. The last one I rented was $250/day with a delivery charge of $75.00. A crane requires a certified crane operator which goes for $100/hr in my state with a minimum rate; that’s for just the operator.  So the forklift saves big time. (They go up to 40+feet, depending on model.)
As far as the charge for connections, that is off topic, but I can say on a condo it would require a licensed electrician at a minimum in my state,
possibly adding the required 120v receptacle as well, as I don’t see that.
Possible changes in mounting, power, gas, drains all add time.
With commercial properties, like condos, we usually have to meet current code when there is a change (your neighbor going from 2.5 ton to 3 is a change).
So as far as cost, there may be multiple trades required in your state and some other changes we don’t know about. So the cost may sound steep to me, but I did not bid the job and don’t know all your local requirements.
The more requirements, the higher the cost.