Inherited Manhattan Apartment Question

[Kathryn Kz]

Hi All, quick question:

I inherited a Manhattan apartment from a parent who was a NJ resident. I am executor of the estate and was named so in the state of NJ. 

I am now trying to transfer the apartment from the estate to my name and the co-op is being very difficult. They are asking me to hire a NY attorney to have me named executor/administrator in the state of NY as well as NJ. 

Is it true that this would be a redundancy since co-op ownership is in the form of stock and not real estate and thus NY state has no jurisdiction and therefore legally there are no assets and nothing to administer in NY?

The co-op will not give me an answer as to whether this is true and just keeps pushing that I just need to follow requirements.

Please help!