Fire rated doors question

[Ron Roop]

Hello Everyone -

This is a great community to which has provided me with invaluable insights to finally purchasing my first multi 3 unit home in New Jersey.

I recently had a state inspection on the property and they said that I'll need to fire rate the doors (approximately 5 doors in total).

Is there any feedback you all can share in terms of getting the doors fire rated besides purchasing new expensive doors?

All advice and suggestion is greatly appreciated in advance.

Ron