Many guests are fed up with all the chores AirBnb hosts require of them while charging cleaning fee. https://www.buzzfeed.com/alexalisitza/checklist-fees-screens....

Fix and Flip -Requires a minimum down payment of 10% with 100% of the rehab financed. 

Another note on construction cost, going vertical is very expensive now and would require have a great connect with a developer and a builder in the area.See what rents are in the area and run the numbers to ensure the rents will cover your costs and give you a solid return—using the 1% rule can help.

Be sure to do your due diligence and make sure the PMC is licensed (if required, it's not in all states) and insured.

What special purpose equipment do you have for an ADU/Office that required unique wiring for it to function? 

However, as W2 earners, these losses are considered passive and can only offset passive income unless you or your spouse qualify as a Real Estate Professional (REPS) by meeting the 750-hour and material participation requirements or STR is used.

Advanced QuickBooks ProAdvisor was introduced in 2007, to get certified the requirement was: one had to be certified for 3 years in a row and had to attend 2 day in person and online courses.

This requires more than I can type here in this reply, but essentially there can be more moving parts unless you do it in a sequence.  

Thank you Each state’s laws vary, but many/most will require a foreign corporate entity to register in that state before it can do business, and holding property title is a business.

You could house hack and use the other portion to AirBnb as then you meet the primary residence requirement in B.C.