The usual way, but not the right way, to try to buy a rental is by finding a property on the MLS, where agents congregate, make an offer and then try to get financing to buy the property.

Gas-meter-gas provider.  

It looks like you are doing an affordable build based on the cost but hard to say since you didnt provide info on the build itself such as square footage and finishes.

Contractors, unless you have a working relationship with them, normally do not want you bouncing ideas off them.Understand what their hourly rate is, have a discussion with them that you are okay with paying them an hourly rate if they walk the property with you and provide you a scope of work along with an explanation of what you can/can't get away with in regards to improvements.ask them if you go with them, if they can credit you the amount that you paid.Once you develop a working relationship with a few contractors, you can bounce ideas off them and expect quality responses.I do not invest in New York.Best of luck. 

Perhaps partnering with a real estate agent using the BP real estate agent finder tool may work out in your favor.

While I don't know the nuances of the market, I do have a client that's a real estate investor and agent in Phoenix that could probably give you some suggestions.

Thank you all for all the information and assistance you have provided 

Like Agents who say they are in the million dollar club.. well when houses were 50k each that was something you know 30 plus years ago..

Pro Tip: Ask an insurance agent what your rate will be before you make that offer.

Thank you very much Kyle.the information you provide is very helpful