What limitations are placed on hot air balloon takeoff and landing sites?

This varies from country to country, but most public parks will allow takeoffs and landings, so long as there is room to do it safely without endangering the public. In built-up areas, height restrictions will generally be in place, so landing in some parks may not be possible. In rural areas such as farmland, the chase crew will endeavour to make contact with the landowner and seek permission to land. The other basic consideration is that there should be enough room to land and deflate the balloon safely.