Parks are developed so there is no need for additional site improvements (Grading, Engineering) or soft cost (Engineering, Permit fees) are extremely low such as permit fees. (Long term liability parks must maintain their utilities, parks require HOA’s / rental / lease cost associated) This allows a much faster project timeline. Private Property Most cases non developed will require site improvements & higher soft cost. such as utilities, water meters, overhead electrical, septic and sewer & engineering in most cases all requiring their own permit depending on your local. (Long term liability for all maintenance and cost) will require much longer project timeline.