I'm looking for a property management system for 10 units and growing.

I'm struggling to find good tools/strategies/professionals to help ballpark the rehab costs so I can make a reasonable offer. 

My PITI + PMI is $2,369/month if I get 30yr fixed at 7% with 5% down.I'm budgeting 5% capex/ 5% repairs / 8% vacancy and I will self manage. 

The other option is to form an LLC prior and both go on the loan in terms of dual borrowers so that the land is used from one owner and the assets or cost to build is coming out of the other partners funds.If you do not own a primary home you can build a home with as little as 3.5% down but cannot use an investor for that option. 

Maintenance costs. $225/month seems dramatically low.

I did not manage the job as well as I could have.

Again, it is worth the cost to talk to a CPA.

I suggest conducting a cost segregation study on both the acquisition and improvements. 

I want to buy a new private home and use my current primary residence equity (plus some cash) to buy a new primary house cash and then sell the old one.So, I am looking for a HELOC with little to no closing costs, as I will retain the money only for as long as I am selling my old house after buying a new one.Any advice?

If they want 78 degree temperatures with windows open they will likely have monthly costs of $3-400.