Have begun talking to lenders but am having trouble getting good quotes on interest rates.

If it's a larger organization, feel free to inquire about their different staff qualifications.2.

It was worth every penny because now I’m properly organized and it significantly cut down the amount of time it took my accountant to prepare my taxes.

If you use credit cards, I recommend having a designated credit card that you solely use for the rental property as well.This will keep your transactions for the property very organized and easy to find for tax season assuming you don't already have bookkeeping set up.

It just doesn't seem like an oversight when literally no one in the organization answers or returns your calls.  

Specifically, I am unclear what the best way is to organize my subaccount; Do I open a new account per property?

Call the organizations and explain what you're doing and someone should point you in the right direction.

I’m a new investor and have begun using the rental property calculator on bigger pockets for my market.I’ve only analyzed about ten properties so far, but I am getting about negative $1000 cash flow per month for most of the properties and negative cash on cash return.  

Plus it better ties investment performance throughout the organization from property porter up to CEO.To your point, there are some vertically integrated operators that charge above market fees for their internal operations.  

You'll be amazed at how it keeps you organized and prevents those dreaded oversights and costly mistakes.