PTAC through brick wall
If you think a mini split is two expensive you have not compared the structural work and possible engineering stamps required for a package unit. The unit will take at least a 3’ wide hole usually ~18” tall this requires reenforcement of the brick and this would be for a studio style, a 2 bedroom unit will be even more because of the brick work.
Having installed both I can do mini split in a couple of hours drilling the ~ 2” hole to the outside is the hardest part (both will require power so we will call that part equal for the new circuit.
Commercial properties require additional B.S. or oops governmental permits in some cases and have to be done by a contractor licensed for the work, where a home owner can do there own work.
To fully compare systems get a quote to put the package unit in the mechanical work alone can double the cost of install.