These are features like online renter payments, tenant portal (for payments and work orders), help keeping track of work orders, tax reporting features, and accounting functionality.

BTW behind Texas.When all forms of taxes are calculated (income, property, and sales tax), CA ranks below the middle of the nation in total tax rate.  

They might double the 50k or better or lose it all but can just get tax write off and then make it back in one month or less.

That helps some...but your variable expenses also go up too - property insurance & taxes - so a lot of your rent increases go to offset rising variable expenses.I started at the age of 47 in 2018 and we bought properties fast and furious - 12 the first year, 10 the next, and 9 in 2021 and currently have 38 properties. 

You can always use a software like Turbo-Tax and follow the prompts.

Finally, check with the Town to make sure there are no municipal liens, Make sure they're on Town sewer, check with the tax assessor to see how many bedrooms the tax office thinks there are, (important if you are flipping) buy ok to have more bedrooms if you are planning to buy and hold.  

How would this be accounted for for general accounting and taxes?  

Is your DSCR ratio greater than 1-meaning are you cash flowing (according to the lender's criteria of mortgage, property taxes and insurance (and HOA) if applicable).

Just a few tips to look into but it usually takes some time to gain steam on your first listing so be patient and keep analyzing the local compeition /your own listing. 

There may be something called a "Due On Sale" clause.Check and see if all tax parcels are included in one mortgage or if they have separate mortgages.You have to have him spell out what he considers to be a "partial seller financing".