That is great and you are stepping into a large amount of doors that are already performing!

Something is off here.For a conventual loan on something around the $150k house I pay around 2%.Hard money, commercial loans, or double closes will cost more as there will be points added.

I never write them without adding in taxes and insurance.

It also largely depends on the area and the type of tenant said area attracts. 

The property has 3 units, and will be owner occupied, but I added the owner unit rent as if I was renting out the whole complex to see what the numbers looked like and here is what I got. 

Where craftsmanship was lacking, a visibly large amount of caulking was used.  

When you're ready, here are some good DO's and DON'Ts when getting bids:DOWrite out a detailed scope of work that outlines exactly what you want to do.Clearly define what (if any) materials you will buy and what the GC will supply.Get multiple competing bids.Check GC references, call past clients of theirs and possibly even ask to see their work.Closely analyze each bid and ask a lot of questions on things that are not spelled out.Ask each bidder for an anticipated schedule for the work to be completed.Ask each bidder about their desired payment terms.Sign a contract/written agreement with the successful bidder.DON'TWaste people's time if you're not serious about hiring them.Walk the job with competing bidders at the same time.Assume that all GC's will see the work happening the same way.Pay large sums of money in advance unless it's justified.  

If there is anything we can do for you with these regards, we are happy to share our professional services if it means adding value to a transaction.  

@James DanchusYea, I don't know how it's possible to get 40 addresses/hr, unless they're picking a long avenue and just adding all the properties along that road. 

They are successful if you mail in large numbers and over a consistent period of time.