This makes it easy at year end when I have to provide rent certificates for tenants. 

In addition, your city or county office will require you to have obtain a Business License (aka Business License Tax Certificate) to operate your business, even if it's home-based.  

If possible, try to get the tenant and the current owner to sign tenant-estoppel certificates before closing.

He got his Certificate of occupancy this past November (5 years later).

My biggest hurdle has been in obtaining a certificate of occupancy, which is a lengthier and more expensive process than I (and my wallet) had hoped.

Once either you or your designated person get a license from City hall, you just go online and print certificates of rental suitability.

“Ready” for rent generally means that a certificate of occupancy can successfully be issued for your property per your locality’s rules.

A Certificate of Publication, with the affidavits of publication of the newspapers attached, must be submitted to the New York Department of State, Division of Corporations, One Commerce Plaza, 99 Washington Avenue, Albany, NY 12231.

I say this is class C- but still in a walking distance to the train station directly to Manhattan Problems: -no green card / Certificate of Occupancy due to violations .

I believe lead-safe certification is necessary between each tenant, and all work must be completed by certified contractors or you must have your own certification.