Can my landlord change the locks on my room and refuse me entry?

You need a lawyer. Contact the Tenant Network in Philadelphia. There is an argument to be that the form you signed is against public policy and...

Real estate escrow deposit ?

I agree. I think you should consult with a real estate attorney to advise you how best to proceed.. At this point you have not provided arguments...

The landlord must return your security deposit within 30 days of vacating but only if you provide a forwarding address in writing within 10 days. ...

DO I HAVE TO SELL MY PROPERTY TO A DISHONEST REALTOR? THE DOES NOT WANT ANY OTHER BUYER TO PURCHASE MY PROPERTY. IS THAT FRAUD

I agree. At the minimum this person should lose their license. Please consult with someone ASAP.

If a house is unfit to live and the landlord is trying to fix it but the tenants won’t move what’s the next step

I agree. And due to the nature of the situation I would hire a lawyer to do so.

Do I have to return the deposit to a prospective tenant who did not move in? Due to her not having the money for first+last rent

It is my opinion that you cannot keep the deposit unless you had her sign some form where she acknowledges thst you told her it was non refundable.

Also the agent violated rules with regard to disclosing when they are a party to the transaction. Please consult with an attorney.

Can my lanlord take my personel belongings without any notice of eviction ?

It depends in the terms of the lease and other documentation you signed!

WWhat are my rights as a co-owner of a house?

It depends upon how ownership is titled. But typically in these situations we have to file a Partition complaint to force a judicial sale.

What should I do if I've been scammed in a rental and now the real owner is threatening to come the next day with a sheriff?

No one can lock you out but a sheriff or constable. They need a court order. Even if you were a squatter they could still not lock you out. You...