Since you're determined to go ahead with Project Feline, have an emergency plan at the ready and rehearse it!
1. Where and how to hide the cats.
2. Where to hide the litter box.
3. How to hide any cat-related odors.
And the plan has to be executed within the time it usually takes you to go and answer the door.
Once you've mastered that, I mean really
mastered that, be absolutely sure nobody â€” and I do mean nobody â€” who lives at the complex or could be in any way connected to the complex (through acquaintance, business or relation) knows you've had cats or now have cats living with you. Remember the old saying, "A secret is something you tell one person at a time." Tell the wrong person â€” no matter how innocent or understanding they pretend to be â€” and you're out on your ear!
Never, ever, count upon landlords or property-management companies to have a scintilla of humanity when it comes to tenants. They don't. It's their nature to value money over human beings, especially tenants; and "you can't change a leopard's spots." (My apologies to leopards everywhere.) You're nothing but a money machine to them! They've the law, which they bought and paid for via legislative lobbying, on their side. Never forget that.
Although it was mentioned with the best of intentions, bear in mind that artificially-darkened windows attract immediate attention in this age of big-money gun-toting drug dealing. Putting a film on your windows is like shouting, "Hey, there's something going on in here I don't want you to see." Similarly, cats perched on window sills is a death wish vis-a-vis your new living situation. You'll have to keep the window sills strictly off limits to your cats, via lots of stable nick-nacks or other seemingly-decorative window-sill objects. It doesn't matter if you live on the twenty-second storey, a cat in a window is visible from a long way off.
In short, you've moved into the wrong place. All your being there does is reward the anti-cat landlords and management companies. Until such time as those of us who pay for Mr. Landlord's kids to go to college stand against the inhumanity and narrow-mindedness of "no cats" policies, the oppression will spread. And the only way to stifle its spread is by witholding money from the landlord policy-setters who own the government.
That's just the way it is. So, good luck! I hope things work out for you and your cats, but be prepared to move into a cat-friendly environment on a moment's notice â€” because that's all they'll give you. I'm sorry, but there's no "up" side to this situation.