@Stephanie Z. You will need a team to do this transaction well. Commercial real estate broker familiar with your market/submarket development opportunities and buyers, commercial real estate attorney, CPA, etc. Have you considered a subdivision of the land into two tracts? It would consist of one tract of ~1 acre for the existing building/parking and a second tract for the remaining ~4 acres. This route would allow you develop and/or sell the remaining 4 acres to a developer and either not sell your business or sell your business on the smaller tract. If you have not developed property, you need professionals in this arena to assist you. Development will require engineering, surveying, land planning and other professionals who can walk you through zoning requirements, site plan approval, construction drawing approval, stormwater, utilities, whatever other approvals are necessary for your jurisdiction, etc. etc. etc.