I've been able to multiply our equity to about $400k on these homes from my original down payment of just $5k!  

For example, if your current single family home was worth $200,000 then multiply it by 80% = $160,000.  

Find the price for baseboards you would prefer to use at home store & multiply times linear feet gives you material cost for baseboards. 

Based on the range of these GRMs, choose a number that seems most appropriate (some appraisers will simply average them all together - others will just choose a number) ... take the GRM value you've decided to use and multiply it by the monthly rent you expect for the duplex you are pricing out - this will give you your "income approach" value.Now, you look at the two values you've just generated and use your best judgement as to which is most accurate - or it might be a blend of both.To give you a real-world example of this, some clients of mine just closed on a duplex in Raleigh ... the appraisal came back with $468k for the sales comp approach - $594k for the income approach - and $480,200 for the replacement cost approach ... the appraiser selected $468k as the market value.Hope I made this clear enough for people to follow and understand...

The multiplier is usually derived from the sales comps that were analyzed. 

Whatever your market rent is can be multiplied by a fixed number of month.

Look at the Gross rent multiplier.  

wow I'm 19 yrs old too and was also looking to try my hand at multifamilys I thought like getting a fourplex would be good but these are hard to ind in my area a duplex or TRU is a great idea because of the potential for multiplied cashflow also hopefully you'll attain appreciation my goal was to acquire these build up equity and appreciation and sale and avoid taxes by doing a 1031 exchange and use profits as down payment on an apartment building  but def I think you should start with multi .

For a monthly gross of $2500.My total investment in two years will be about $102,000 on the high end.Breakdown of returns:Gross rent - $30,000Expenses - $6700NOI - $23,000 Cash on Cash return = 23% first yearCAP Rate = 22.55Gross Rent Multiplier = 4.4Estimated property value upon completion of $162,000 Cash is king right?

Only requirement really is that you make six on-time payments first -- so instead of multiplying the payment at the higher renovation interest rate by 360 and flipping out, multiply it by six and stay calm.