Can we sue a US corporation (in the a US) for breach of contract of their subsidiary abroad?

"on the same merits." Do you mean the same claim?

Do I have to pay an attorney who was not part of a retainer agreement?

When you retain a law firm, the law firm is free to assign different attorneys to your matters. Most firms do not list all the attorneys in the...

What happens when attorney for personal representatives of the executors of estate destroy a codicil

That's a serious allegation. Careful. Can you prove the attorney destroyed the codicil?

My squatting rights!

You're a tenant, not a squatter. Why not try to remediate the smoke entering your space rather than moving?

Can I take a bar owner to court for continuous noise and stress?

You have a valid claim. I've litigated noise cases before.

Is it legal to sell counterfeit Rolex, Cartier etc watches in New York City?

And what is your interest in this person's affairs?

If I were representing the Landlord, I would advise the check be made payable to both.

Does filing fraudulent/forged documents with respect to real estate property/lien, nullify the contract?

The documents need to be reviewed by counsel and then discussed with you.

A contractor/partner signed contracts without my knowledge, did bad jobs and disappeared

Retain litigation counsel and see if your insurance carrier can assist you in any way.

Lease calls for me to pay portion of annual property tax. Never rcvd statement and have now been billed for past 5 years. Legal?

Laches and estoppel come to mind. You're entitled to the documentation.