Is it legal for condominium unit owner to install surveillance cameras in common hallway without permission of his neighbors?

As stated above, your best bet is to speak to the condo board.

I agree with the answers above, assuming it is not a regulated building, a landlord is free to do as he or she pleases and renew some, none or all...

Renting to Section 8

Are you asking if it's possible to have a lease from the building to the tenant or a sublease (tenant to tenant). As stated above when the lease...

It all depends on what it says in the proprietary lease. Some buildings may impose fines while others can force the owner to sell the unit.

Landlord sent us a letter stating she is not renewing our lease?

I agree with both attorneys above. Look at the lease and see what it says about renewals and also check whether it is rent stabilized building. If...

If I file an Order To Show Cause in a foreclosure matter and the judge does not sign it, is this decision appealable?

As stated earlier, OSC if not signed, can not be appealed.

Can one attorney handle this transaction?

As stated before, if wavers are signed, single attorney can handle the transaction.

Landlord left notice under door making amendment lease.

I concur with earlier answers. The landlord cannot enforce the amendment. But if it something that does not affect you in any way, you may consent...