You can apply to the Planning Department for a Conditional Certificate of Compliance (CCofC). Issuance and recordation of a CCofC can legalize a lot for purposes of sale, lease or financing. The CCofC identifies the conditions and improvements required before any development is permitted on the property. These conditions may include all the improvements (e.g., roads, water) that would have been required on the date the innocent purchaser acquired interest in the property; and in most cases, the lot must meet current standards, including lot size. ALL conditions must be met before any development can occur on the property.
A CCofC generally imposes the same requirements for development that would have been imposed if the property had been properly subdivided and the cost and timing are similar. The CCofC identifies the conditions and improvements required before any development can occur on the property.