You do that with skill, time, and reputation.

I went to someone who was considered a reputable broker and he said he had a great new program.

Use this amortization table, from a reputable website:http://www.bankrate.com/calculators/mortgages/amor...Ignore the difference in layout/presentation - what's important is that the ending balance for each month in their table matches mine exactly.

Quote from @Michael Simmonds: Hello BP Family,I am in need of a reputable builder/GC in Cape Coral who is willing to take on a partially finished new construction home. 

Our agent seems incredibly stressed by it all, she's spent decades building her reputation which is now being dragged down by this guy but I don't know what she can do.  

They can change terms basically at anytime before closing for non-owner occupied - is it good for the reputation - absolutely not - but it does occur.

Note investors who think learning from people who scam others out of millions is a good idea and a way to have a good reputation in the space. 

The website 51west.properties also scores low on scam advisor ("owner is using a service to hide their identity, high number of suspicious websites on the server, registrar has a high % of spammers and fraud sites, website is (very) young, website appears to be hosted by a company with a bad reputation", all according to https://www.scamadviser.com/check-website/51west.properties...)Trust your instincts. 

Reputation and referrals matter.I invest out of state, and I’ve been burned by bad contractors before—it’s a fast way to lose money.

I learned the hard way that going with Moen/Delta/American Standard, well known reputable brands for showers & faucets.