I've had varying responses from colleagues so I'm reaching out to the experts for advice.My first instinct is to pay off my mortgages early using the conventional method ($300/month extra principal payments).

The only issue is using this method, one city in LA county would cost me the whole tax delinquent roll from the county itself. any suggestions? 

The two other methods I am aware of are installing a motorized main damper to direct flow to the area calling for it and hydronic boilers driving several remote air handlers.

My question is should I do the brrrr method and take more time to accumulate  properties or should i only use down payments and mortgage the properties from the get go in order to start with more properties????

Not to say this method is wrong, but just be aware that this is going to run like an apartment and your cash flow will probbaly be okay if your willing to put in more mangement and cost per home. 

I am open to the BRRRR method, but I don't think it works very well in my current market. 

This is a state-by-state issue and there are several different methods. 

That shows a little cooperation.I would probably try the cash for keys method I hear a lot of people using now a days.

I know traditionally with the BRRRR method, most lenders want a 6 or 12 month seasoning period of the property being rented.

I would have personally recommended using a different method to avoid some of the issues you're seeing now.