Selling an 80 Unit Condo - Understanding the New York Real Estate Market

[Garrett Finnell]

I'm helping a client of mine with the sale process of his Multi-Family/Condo site that's in development. 
*See here for post about the property specifics* 
However, I'm in a different state (Oklahoma) and I'm trying to wrap my head around some of the intricacies of a big development sale in New York. My political intuition tells me that Oklahoma and New York probably have some key differences when it comes to how their real estate laws, transactions, and operations play out during the sales process. 

Are there any natives that can clue me in on things like:
-Typical time-frames for different aspects of inspections, title/ownership proof, financing contingencies, etc... 
-Important (or unusual) inspections needed for that area. 
-Need for a real estate lawyer and what to expect.
-other questions I don't even know to ask?