I’d like to get her a safe place to live but can’t afford to cover the difference if she can’t pay market rent, so this seems like an ideal solution to keep her housed and safe.

Ideally I find a property to live in and rent out the other unit, and having the property eventually cash flow when I move out and repeat the process ( From my research so far this will likely be outside seattle?).

Maybe @Jay Hinrichs can help you, he's developed all sorts of projects. 

Do a risk assessment of these factors, then develop your strategy.You will have a stabilization period with possible negative cash flow, but once you get through it you will have a much easier time with your own tenants and lease. 

Red flags are foundation issues or less than ideal neighbors.

I am a little nervous but my hope is to connect with fellow investors, agents, contractors and buyers and develop long lasting relationships and partnerships with them to grow this business and make some money. 

Then you can develop a long term relationship with that banker and be on your way.Using this method, I was able to find a couple banks that can work with me on terms similar to what you outline.  

Also, the strategy is not ideal in some states.

The contractor has given a bid for 630 K for a turn key (including the development of a retention pond).

I am looking at a piece of land that has the potential to be turned into conservation land and sold as mitigation land credits to developers in the area.