John, I use a collection agency for my management company but I do not believe they deal with one off accounts.

(you may want to pick out several based on different lot situations)Based on your plan you should be able to get estimates, You can either go to builders with their plans and ask them their cost to build pre sq.ft. or sq.m, or you can get actual pricing based on your plan. 

I've recently had to switch cleaners and that is costing me an additional $50/stay.

I think your quote is low and it will end up costing more.  

I'm also currently working on getting my real estate license and Project Management certification.

And my agent for the replacement was already my property manager for my other rentals so I used their realtor service.

Buy Right Manage Right Finance Right®Gino

We prenegotiate with builders to provide new construction investment properties to our investors that offer incentives like free property management, rent guarantees, and rate buy downs that can get conventional rates to 3.75%.

Single-family homes and small multifamily properties are popular choices here.It's also a good idea to connect with local real estate groups or online communities for advice and to find good property managers.

Another 1% in seller closing costs of various types, and another 1% for seller paid title insurance.