Combining House lot and Shop lot into 1 tax lot

[Bobby Vernazza]

HelloEveryone, 

I have my eye on this property that has been abandoned for the past two years or so. It is in need of some good rehab including siding work, roof, floors and a full basement remodel. I've contacted the owner and will be giving him an offer sometime this week. However adjacent to this house is a three and a half acre lot with a large shop on it. My guess is that these two lots were initially one, however according to the MLS and county records the shop is being sold separately from the house, yet it has no physical address. I'm hoping to purchase the house and then purchase the shop property through the MLS and ultimately combine them creating a 4 acre lot with a large house and shop which would be very attractive for the resale. What is the process of combining these two lots back together? Has anyone been in a similar situation? The property is located in Marion County Oregon. I look forward to hearing what everyone has to say.