In the Miami 21 Zoning Code, T4-R stands for ‘General Urban Zone – Residential,’ which requires a special ‘Warrant’ to operate an Airbnb legally. Unlike T4-L or T4-O zones where lodging is allowed “by right,” T4-R hosts must apply for specific city approval to ensure their short-term rental doesn’t disrupt the residential character of the neighborhood. RankCohost specializes in navigating these T4-R warrant applications for local owners.