My view of an eco friendly is a house that truly takes into consideration the form-function rule of architecture. 

Im currently negatively cash flowing.

Have a few turnkey BnB properties I'm evaluating but not sure how to assess flowing revenue streams.

Best thing you can do is find an insurance broker that will shop each renewal to ensure you have the best coverage for the best cash flow. 

(Can I use the estimated cash flow of the house as proof of income for mortgage applications?)

We can screen the clients and we also have a constant flow of rental leads.

Thanks for your consideration,Isa

Are you aiming for consistent cash flow, or are you more interested in the property's appreciation over time?

But you don't invest for the first 6 months when you lose money, but you invest for 3, 5, 10 years down the road when you are selling it, pulling equity, or you are getting $800/month cash flow because the market is up again and inflation is up.

That is because markets with good initial cash flow have that good initial cash flow because their appreciation and rent growth outlook is poor.