here is a link to the zoning scetion of Shelton's website.
If you look at what is required for a multi family property, you will be able to understand what will be needed for a conversion. Any conversion will have to meet all of the codes a new multi would need to meet. You have to consider things like: sewer or septic, road frontage, lot size, parking availability, etc. There is no simple answer to your question, you will have to look at each property individually and see if it meets the requirements.