If you haven't already you can use the BP Rental Property Calculator or as Brandon Turner recommended in a webinar the Wholesaling Calculator (just put $0 as the wholesaling Fee) as it has more features.

We hope you like all the improvements, and we promise to deliver even more great features to help improve your networking, education, marketing, and of course, dealmaking on our site, soon!

In many old buildings, many of the features don't meet present day code. 

If the agent does an Open House and "identifies features" or engages in conversations about the property, then they are required to have a License.

Is there something other than Mail Chimp that has tools/features that can help better leverage the connections between customers, lenders and servicer's? 

You may want to start attending some local real estate investing networking events here in NYC.You can find the events either using the events feature of biggerpockets or by going to meetup.com and searching for a group.A lot of attendees of these events live in New York and invest in areas that are more cash-flow friendly(upstate, CT, MA, PA, NJ etc).I went ahead and pulled up some events that are occuring in NY in the near future.https://www.biggerpockets.com/forums/521-events-an...In the meantime - feel free to be more active on the boards - alot of us are very friendly and helpful!

I asked this question in a separate post, but figured that would be not relevant to the original question, hence reposting here - What are some of the methods to determine a neighborhood class (A, B, etc)? Especially ...

I just looked for one that didn't have features going across the back wall.

You don't need to spend a lot of money going high end or adding unusual features.

I'd then build a landing page, hammering away at the features, benefits, and mock pricing.