@Kevin S.I recommend putting all properties/accounts into a revocable living trust for estate planning. 

I've found you can negotiate a flat fee service at a slightly higher cost if you prefer consistency of cost over the risk.Fees - not typically large but transaction and back fees can add up in to the hundreds, if not thousands depending on volume and plan type.Income - additionals.

Just make sure you’re prepared to cover any shortfalls on that property and have a strong plan for deploying the new capital effectively.

I knew a developer before the exception for being near mass transit planned to build 4 units but was only able to build 3 units.  

While my insurance charges are relatively low each year given this is a condo, I learned to better assess who is behind budget planning at the HOA level for all of the units for roof, cleaning costs, basement improvements (shared by all units), given this was run well by one individual.

You can scale from there.If you are planning to stay in the area long term, I recommend buying a primary. 

So, a few credit cards at the parent entity level works better depending how much you plan to scale but this requires more work on the bookkeeping side.Just ensure you keep things as simple as possible and always think about things from an operational perspective as you grow.

Personally I try to reserve my HELOC for emergency or unexpected costs during a project, so if you can try not to use all of it for the initial purchase and planned rehab.

You just plan to sell lots, correct and not build?  

So plan on replacing carpet A LOT.