The problem is that you'll run out of ability to get conventional mortgages at some point, and you'll still have to find partners, or other types of loans to keep moving.... cross that bridge when you get to it. 

As you practice more, you'll feel more confident in your ability to predict these figures and then you'll be better suited to put together a deal. lastly, you can and should always negotiate prices

The reason you don't find CPAs and Lawyers sharing firms, most of the time, is that there are restrictions in most states on the ability for non-lawyers to have an ownership share in a law firm, which limits the ability for lawyers to associate with other professionals.

She needs to provide you a bill that details her charges, just like any other contractor would.If I were in your shoes, I would have to have a difficult conversation with your partner and possibly his wife, and talk about all the issues you've laid out here. 

Having the ability to market to college students looking to move off campus is great for a rental property.

Short paragraph(s) about you, the pitch is about your ability to pay. 

What's safe depends on your level of risk, knowledge and, and ability to predict the future.  

There seems to be a large disconnect between contractors/tradesmen and the ability to effectively conduct & run a business.  

This loan is based off the performance of the property and your ability to run a business.  

It's not as much about what you say as it is what THEY say and your ability to listen and make your offer work for them and their specific situation.There's no one-size-fits-all pitch.