Confused about how I’m supposed to install minisplit/AC in apartment

I've picked out an apartment that I'm supposed to sign a contract for soon, however there are some details that are a little fuzzy and I haven't been able to get a good answer from the property management company so I'm hoping that someone here may be able to provide some insight.

The apartment is a 2LDK and it comes with 1 AC unit installed in the bedroom. The outdoor unit is sized for that specific unit, so if I wanted to add another one I would need to buy it myself. I would like to install one in the living room, however I'm confused about how I am supposed to do that. It appears the previous tenant had one installed since there are holes on the wall where one was mounted, and there are "foot" marks on the outdoor balcony where the compressor unit was installed.

The management company has told me (through the realtor) that I am not allowed to drill holes in the concrete (the wall), make any screw holes, or run any lines through the air ducts that lead outside. They said I should have a contractor come out and give me an estimate and to figure out how to install it. My confusion is that they don't want any screw holes, so how am I supposed to install the indoor unit in the first place? And how am I supposed to run a line inside if I'm not allowed to use the air duct (which is right next to where the previous tenant's unit was installed, conveniently) or drill holes? This whole thing is confusing to me, and not having an AC installed in that room is pretty much not an option since it's going to get very hot in the summer and I'd like to be able to use that area as an office/living space.

Any ideas? Am I missing something important here? Does the management company just not know what they're talking about?

by East_Reaction_9698