Can a landlord sue you for something he/she refuse to do?

You need to retain a lawyer to defend you. Hopefully you have written documentation showing your requests to fix the leaks.

Can a Landlord break a signed lease renewal without lease violations?

It depends entirely on what your lease says.

What do I do if the new landlord and the old landlord both want me to pay rent?

You probably need to put your rent in escrow until they work out their problems. I would contact a lawyer so you don't end up dealing with an...

Part 4 to the "landlord approves then denies application to move..."

Unfortunately, your posts are not linked and we cannot see them all. I would suggest, given a lot is going on, that you get a consultation with a...

There is a herion and crack addict in my building who can I call to report people coming in and out the building all hours?

Call the police if you are sure about drug activities. You can also tell your landlord the disruption.

"Keys are due Saturday, by 12 midnight." Should I return them by 11:59 p.m., Friday?

Yes, you should return them no later than 11:59 pm Friday. But you don't want any accusations that you failed to keep whatever agreement you are...

Is a breach of lease fee binding in PA when there have been NO damages?

Yes. The breach of lease is irrelevant to physical damages. The lease was still breached.

Do I have to pay attorney fee even though rent will be paid in full by their agreement.

It depends on what your lease and the letter stated. By failing to respond in time, the landlord might well have had the lawyer begin the process...

Eviction

In most counties you have to go to the local sheriff. Give a call over there and see what they tell you.

Since you didn't sign the lease, you shouldn't have a problem getting your security deposit back, regardless. The application fee will depend on...