Is it legit to pay the 1st, last month, and brokers fee to get the keys for a new apartment, then sign the lease later?

This should not present much of a problem. If you have the keys and possession it is ok to wait for the lease. If you don't get the signed lease...

If I was made a power of attorney while someone is away and the tenants are not paying their rent can I evict them

Technically, assuming the power of attorney grants you this power you may commence eviction proceedings. However, as attorney pankowski noted,...

I've been living in my apartment for 5 months and now my landlord is asking me to get rid of my dog. What should i do?

You should hire an attorney. You are going to need one as this is headed toward a trial on whether your dog presents a danger to others.

Age renting apartment.

No. They can ask age, do credit checks, background checks etc. they are entitled to know who they are renting too.

If I surrender my auto in chapter 7 ( loan is 14000, value is 8500 ) can the creditor go after my cosigner.

yes - if they sustain a loss they can look to the co-signor for payment.

usually means by midnight Thursday

My husband cosigned a mortgage for a co-op for a friend. Now the friend is gone and the wife of the friend has filed for bk

Your husband should have been served with a summons and complaint stating that a foreclosure action had been commenced. As a co-signor or gurantor...

Can a tenant from a subleased apartment sue me?

He can sue but he won't win. There are no provisions in NY law for a tenant to recover past rent.

My roommate, does not want to move out and refuses to pay the rent, and I don't have any written contract with the roommate.

Who was the original tenant? Whoever that person is can be held responsible for rent. Consult with an attorney.

How can I find the commercial value of a property that is currently used as residential?

Hire an appraiser or consult with a commercial real estate broker.