In situations such as this, if it's a multi-family, an appraiser might use Gross Rent Multiplier and/or CAP rate and compare to other large multi-family properties in the town/city/area code. 

A conservative rule of thumb is that you take your gross income annually and multiply it by three.

The amount that you will actually receive, in a partial loss, will be arrived at by multiplying the claim value by a ratio, with the ratio being: insurance amt divided by (80% of replacement value), assuming 80% is your coinsurance percentage.And guess what, the likelihood of a partial loss is many times greater than the likelihood of a "full burn down".This is how it has been explained to me.

I recommend you explore areas within 30 min drive from your locale and explore if you can make positive csh-flow purchases in your area.Use redfin.com and homeseekers.com to see what is available in the desirable zipcodes.Analysis are simple: rule of the thumb is at GRM (Gross Rent Multiplier) this is a fancy term for a just a quick simplistic evaluation were property price is divided by gross yearly rent.Usually, 6-7 will produce positive cash-flow, 8-9 break-even, 10 or more is negative cash flow.There are other calculations, but this one is quick and dirty.I can tell you that you will find out that property located in not s good areas (mine are in South LA) will be more profitable, but you have to explore your market ..

5-10k if you buy the materials and do it yourself otherwise multiply that number by a factor between 3 and 10

The properties market value after repairs multiplied by .7 should be equal to your cost off acquisition and repairs.

If you need $20k and you buy a $100k property in a market that is appreciating at 20%, that house will multiply in to a bunch more houses all on its own. 

Learning how to build and being able to multiply my income.

A property's tax bill would increase as a function of roughly two things multiplied together:1) How much that property's value has increased relative to other properties in the same jurisdiction.2) The overall increase in the jurisdiction's budget from year to year.If your value is going up in dollar value but percentage-wise it's roughly the same percentage as everyone else's property the main relevant factor is #2.

Learning how to build and being able to multiply my income.