The amount of information you have provided cannot be used to provide you with a good answers.Generally you take your rental income and subtract all the expenses that you incurred this year.

Now subtract the cost to purchase the existing property, cost to demo the house, and cost to build a 4-plex from the ground-up.

figure out what a conservative ARV is for the property, then multiply by .75 (or .8 if you can definitely get that), then subtract 6k, then subtract closing costs / holding costs, then that number is your offer price. 

Take $1.2M and subtract the associated costs of the home (i.e. purchase price, closing costs (purchase and sale), and remodel costs). 

I've since depreciated a total of $2,000 of the roof's cost on my annual taxes each year since.When selling a rental property, Net Adjusted Basis = Purchase Price + Improvements - DepreciationIf I sell this property now, how do the above amounts factor into my Capital Improvement additions / Depreciation subtractions?

I'm unsure of the laws in California, but if I was unhappy with the way the property was cleaned or taken care of when they moved out I would just subtract it from their security deposit.

Make sure you have a conservative cost of repairs and a solid ARV (Subtract about 10K from that ARV and that will be your new ARV).Then if this really is a great deal, get some private money lending and flip it.

.), divide in half and subtract the mortgage rates.

Example:- House = $100,000- Downpayment = $20,000- Loan #1 = $80,000- Rehab = $20,000- Rent = $1,000 / mo (Assume 1% “rule”)- Re-evaluation = $150,000 (assume)- Refinance (80%) Loan #2 = $120,000- Pay off Loan #1, subtract rehab to see gains- Gain = $20,000 for repeat on next down payment on property 2But now you have to a loan of $120,000 rather than $80,000 and your tenant is still paying $1,000 per month from your previous calculation.

Right now, I'm accounting for the rent, then subtracting mortgage, RE taxes, insurance, and property management.ALSO, if you do or do not, what are the numbers you look for?