However, in addition to the new tax, the new rules are very restrictive on those that were following the model of renting out multiple bedrooms in their homes as the number of rentals on a property is now capped based on zoning. 

You just have to build that into the cost models because those expenses will come.  

Many people use many different models to gauge what a good deal is.

No small freelancing tasks, but rather creating streams of income, solid business models, that can grow in the future.I am thinking of a marketing firm, developing apps, becoming a property manager, being a teacher on the weekends.Any feedback is great!

We have a business model and plan in place.

Maybe it will benefit others:https://www.homedepot.com/p/Kwikset-660-Series-Sat...I see the benefit in it (I guess) but if you lose the original key with this model then you are out of luck.

I'm personally curious about how folks are doing that are building out this model. 

If you are mathematical and want to get real detailed with it, learn how to write a discounted cashflow model in excel. 

This model fascinates me.

I talked to them in 2010 when i had a semi complicated business model. and of course they lead you one you send your bizz plan.. and very few questions later lo and behold your approved.. subject to underwriting which will be 10k.. they preyed on beginners who wanted larger loans which no beginner on the planet would ever get from a legit lender.so I was like no way dude.. you did not ask enough questions.. so i passed then learned on American greed they are were crooks of the first order.