Detailed cost breakdown of 500 sq. ft renovation down to studs?

[Dan A.]

I'm considering the purchase of a 4-unit investment property where one unit is going to require a gut rehab basically down to the studs, and I am trying to figure out how to incorporate that into my offer price.

Is anyone willing to break down the cost for something like this? Here's the pertinent info:

Apartment: 500 sq. ft

Foundation: Assume no repairs needed

Roof: Some surface granulation failures, will need to be repaired

Full gut renovation of kitchen, living room, bedroom, and bathroom.

Appreciate any and all thoughts. Thanks, Dan