converting a 2 family into a 3 fire sprinklers required?

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This is in Massachusetts. I'm buying 1st property and there's zoning board approval for a 3rd unit in the walkout basement.  Does anyone have experience with converting a 2 family into a 3 family without having to retrofit the entire building with fire sprinklers? 

Thanks in advance. 

Just found this in an older thread.  Sorry..