Asset purchase basis allocation & taxes

Hey searchers-
I'm closing my first acquisition this week. In discussion with seller's lawyer, she told me that I'll be paying sales taxes on the personal property transferred from the business, and even though my APA didn't mention it, she wanted the language to state that I'm paying that sales tax.

My original offer was all-in $750k. i know we need to agree on how that is being allocated across assets in the business. But what are the general guidelines for deciding what gets allocated across the purchase price? And do i really need to pay that sales tax?