It doesn't take long to get good enough that you can look at a property and analyze it in your head or on a napkin.

napkin math.

If I was doing this first thing i would do is talk to the county office that control sanitary and see what they will allow. this of course assumes your zoned correctly etc.. 

@David Lutz back of the napkin calculation would say $10k month rent with 5k for taxes, insurance, property taxes, maintenance and repairs plus cap ex and reserves which leaves 5k for principal and interest.

Our strategy is to buy land cash, take construction loan to build the structures.Some napkin math for this strategy:Land cost : $200,000Building and furnishing Cost: $400,000 for each A-frame (Provided we have electricity, well ready )Airdna revenue estimate shows $400 night rate with 70% occupancy.

So many properties haven't been sitting empty, as people deserted hotels with a higher risk of contamination and sanitary measures for short-term rentals in which they can control their environment.3.

Biggerpockets has revealed so much back-of-the-napkin wisdom about the 1% Rule, the 50% Rule, the 70% Rule, etc. and the lack of availability of those deals may have some new investors frozen in place. 

After researching online I found landlord responsibility under California Civil Code section 1941 described as followsClean and sanitary buildings, grounds and appurtenances (for example, a garden or adetached garage) which are free from debris, filth, rubbish, garbage, rodents andvermin. 

I'd need to hear more details so just going to give some back of the napkin responses. 

Further more, some back of the napkin math at an avg of $1500 per month per property is:$1500 x 12 x 5 = $90,000.