Engineer or home inspector

I am looking at a home in Crown Heights to purchase. The home has a lot of character which I would want to retain, such as mantles, floors, skylight, etc. Among other things, the kitchen and bathroom would need total renovation. I would also be looking to turn the basement into a legal rental unit. Would it be more beneficial to hire a home inspector or an engineer, prior to putting in an offer? I would like to get a true scope of the work/cost involved in renovation. Any suggestions would be appreciated.