You must have the intent to hold the relinquished property and the replacement property for rental, investment or business use. 

Since my RE financing investor does the incentive of paying for the property, I want to make sure that my business partner is getting a great ROI in profits, so I want to make sure that money is working for the first investor making a deal with me in the smoothest way possible! 

It depends on how the transaction is structured, and the history of the title and timing. 

I would love to hear from others doing flix and flip in NYC on their experience on doing this business.

Lots of posts on different companies so be sure to check out what people have said about vendors you are considering doing business with.

Me personally I look at my rental as a business everything is paid for by rental.

I also own a water restoration and general maintenance business in the area and the amount of STR owners that we have spoken with is insane.  

Start with small goals, and soon enough, you'll find yourself turning away business.

Its not as easy but once you are up in running you are building a brand, equity in your business, and also constant flow of leads.

I've helped people with SBA loans to purchase real estate for a business, but for buying rental real estate, the DSCR loan is a much better option.