Before you run out and spend $3K because some bozo on here told you that DMM, CC, D4$ or etc. etc. works...find out the Cost/deal.ONLY after you have a very accurate number on the cost per deal, multiply this number by 1.7% - 2%.

I would call an appraiser in your area and ask what their gross rent multiplier is.

Rough estimate would be: Income - 8K per monthRough NOI Calc (Multiply by 60%) = 4.8K a month = 57.6K 57.6K/875K = 6.5% Cap.Not terrible, but would want it to be more around 8%.

Simply multiply $18,200 x12 and divide by 8%.

Valuing a 4-plex based on income, most investor would use a GRM(Gross Rent Multiplier) Value/Gross Rental Income= GRM.

I like gross rent multiplier, how much the property produces compared to its costs.  

I usually start with what the average $ per square foot in your area is and multiply that by the sq/ft of my subject, then look at sold properties near the one I'm analyzing and check out what is for sale around there. 

Not looking to get into a long winded debate on this but this is the one I go by:If you multiply your annual expenses by a number between 25-30, whatever number you arrive at is your needed number (higher for those more conservative, lower for those who are less). 

For a quick reference when I run my estimates, I take the bottom floor square footage divide by 49 (as piers are supposed to be no further than 7 feet apart on a single story) then multiply by $350.  

Then, that percentage is multiplied by the amount of principal that is received each year.