I would give them a notice of non-renewal of the lease NOW and also give notice to move the "dead" vehicles out NOW.He'll argue that the motorcycles are not recreational vehicles.

I'd like to get out ahead of some predicted statements that I am not looking to argue or debate:"You should never buy a house with someone you are not married to." 

You can try arguing this but I'll get to that later. 

I would argue that because of this, a property rented by the room will most likely actually have a reduced value when it goes to be sold. 

If I say to stop listening to all the people guiding you in the wrong direction (not opinion but fact), how can you argue what I am saying.I am telling you to use your intelligence, common sense and be honest.

Like "contingent on x% financing from abc bank at x% for x years."

That way, they can't argue with you about it later on. 

Check out this link from ABC....https://abc7.com/los-angeles-airbnbs-la-city-council-short-term-rentals/11809350/ A study found a third of L.A.'

Depending on local laws, I would argue that the tenant has rights to push back because she signed a lease with written expectations, not verbal.

Before I finished reading your post, I was getting prepared to respond with exactly what you have identified in your final paragraph.I'd sell this house for sure and redeploy the capital into something else that can generate 7-8%+ cash on cash returns.Some might argue that SoCal is more of an appreciation play and that your appreciation will outpace your cashflow in any other market.