Purchasing a home with a garage converted into more living space

[Arthur Rivera]

I might make a purchase on a property that has the garage converted into more space I've never dealt with anything like that before. I don't see it on any records with that modification (permits or anything). How would some of you address this or what are some things I should look out for? Any help would be greatly appreciated thanks. P.S this property is located in Farmington hills, Michigan