The owner did not know why the number 2 lumber was not as good as the number 1, did not know how to even read an engineering drawing to see what was to be built. 

I would buy the property from someone other than the person that will be managing it.I recommend you start by reading Long-Distance Real Estate Investing by @David Greene before jumping in.

Typically its no Issue untIl you have to do an evictIon or when cIty fInds out.https://www.citybuildingowners.com/rules-for-new-york-city-basement-rentals/Read the article should have the details you are looking for..

Still studying deals, reading what I can and listening to podcast.

Read your contract.....get an attorney’s help if you think you need it.What exactly are the “defective works behind the drywall”?  

I'll definitely check with the city on the items you mentioned and report back.Some additional questions I have after reading your response and thinking about this a bit.1. 

Greetings to those who take the time to click and read this and thank you for doing so.I'm just starting out down this path. 

I want to get my feet wet and make a deal already but I'm not sure if im rushing into it.I have started off reading Rich Dad Poor Dad and it was a fantastic read and now I'm going to buy Davird Greenes book of out of state investing.

Thanks in advance for reading. 

Thanks very much for reading and for any help that you can provide!