Buying old 1890 triplex. Need contractor expertise.

[Bethany Johnson]

My name is Bethany located in St. Paul MN. I am a first time multi family buyer. I have an off market triplex that that is in bad condition that I want to put an offer in tomorrow. I need a contractor experienced with quirky old historic houses to walk through the house with me making note of all the problems. That way I can get a good idea of the real cost of this place in order to make a wise offer and to have the right numbers for financing.
Not sure if this is an industry standard practice or a unique ask, but does anyone know of a good person for this and how much is reasonable to pay them for their time and expertise?  I am not a seasoned professional but a motivated learner wanting to avoid huge mistakes on this deal.

Ideally it would be someone who enjoys sharing their knowledge of their craft and loves to answer questions.