What are the four types of leasehold estates?

The four types are estate for years, periodic estate, estate at will, and estate at sufferance. An estate for years has a definite start and end date and terminates automatically without notice. A periodic estate automatically renews at the end of each period, such as month-to-month, and requires notice to terminate. An estate at will has no fixed term and either party can end it at any time, though most states require reasonable notice.