Deleading apartment in Massachusetts. What should be replaced?

[Linda Roberts]

I recently purchased a multifamily and now one apartment is vacant for renovations. Lead paint status is unknown, but a year built is 1900. 
Before calling a lead inspection i wanted to get some idea of what need to be done under the new laws of 2017. If I have lead paint on doors and door jambs, do I need to replace them? What is a less expensive way to delead doors and door jambs? It looks like I can't encapsulate doors.
I wanted to start from encapsulation of all walls and trims, but then found that I can't do it before the inspection. Is it right?