Either the owner of the property or the tenant or occupant may request an intervention agreement; However, the contract must be signed by the owner of the property. You must hire a lawyer to enter into the intervention agreement. If you want to buy a house, a real estate survey can be one of the things that appears. This is useful for identifying property lines as well as existing issues, including potential interventions in your space. If your application is accepted, you will receive a digital copy of the draft intervention agreement for examination and enforcement. Structural interventions occur when a property owner specifically builds something on land they don`t own. This is typically between neighbors, but it could also be between the owner of the land and a municipality, as streets and sidewalks are often owned by the city for public use.