I have found most management companies take 10% rent plus one half to one full months rent amount when filling a unit.  

Sell it and with the amount of hours I put in, the 25kish income would hardly make me feel good. the rental market here is BOOMING. so I could get top dollar as a rental.

Without that, prepare to spend a very significant amount of time chasing deals.If you have no startup cash at all, you're probably better off looking for a local partner to work with for a cut of the profit.

(A recorded trustee's deed (or similar alternative) confirming the amount paid by the grantee to trustee may be substituted for a settlement statement if a settlement statement was not provided to the purchaser at time of sale.)The preliminary title search or report must confirm that there are no existing liens on the subject property.The sources of funds for the purchase transaction are documented (such as bank statements, personal loan documents, or a HELOC on another property).If the source of funds used to acquire the property was an unsecured loan or a loan secured by an asset other than the subject property (such as a HELOC secured by another property), the settlement statement for the refinance transaction must reflect that all cash-out proceeds be used to pay off or pay down, as applicable, the loan used to purchase the property.

So I've heard about the 1% rule & 2% rule (or guidelines) when purchasing a rental property: the monthly rental rate should be 1%-2% of the total amount you have in the property to make it a good investment. 

Currently I have a good amount of money saved up (I believe) to start.

The existing quad is listed for sale at $1.1M and a 5.3% CAP.Commercial multifamily in the area sells at a CAP rate of roughly 4.5%.The existing property is zoned to allow for 6 units and has available land to build an addition duplex for ~$150 per sqft.Assume 1000 sqft duplex at $150,000 and we’ll build that into the loan.After expenses, the additional units will each increase the annual NOI by $14,400 = (Gross rent – operating expenses = $600x12x2).Purchase Price  $1.1MMConstruction:  $150KLoan amount: $1MMTotal for project:  $1.25MM20% down: $250KPre-construction NOI:   $58,300Post construction NOI:  $72,700What is the estimated property value after construction?

It's the promissory note that contains the promise to repay the amount borrowed. 

I currently work in the construction field and have gained a decent amount of knowledge in regards to residential construction.

My question is when analyzing a deal what amount or percent do you add for a fully rented multi family home?