After a 15-month lease expired, a tenant paid one month's rent and received a receipt. What type of leasehold does this represent?

The situation described indicates a tenancy at will. After the expiration of the 15-month lease, the tenant continued to occupy the property and paid one month’s rent, receiving a receipt for that payment. This implies that the landlord has allowed the tenant to stay under a new agreement that is more informal than a traditional lease. In a tenancy at will, there is typically no fixed duration, and either party can terminate the arrangement with appropriate notice.

The receipt for the month’s rent suggests that there is an understanding of continued occupancy, but without the formalities of a documented lease. Instead, this creates a more flexible living arrangement that can be ended at will by either the landlord or the tenant, reflecting the characteristics of a tenancy at will.

The other types of tenancy mentioned do not fit this scenario. For instance, a period tenancy would require a set period of occupancy with automatic renewals, a tenancy for years indicates a fixed duration with a specific start and end date, and a month-to-month tenancy usually refers to a lease where rental payments are made on a monthly basis, but it typically starts from a formal lease agreement. The details provided hint at a more transient arrangement, aligning with the principles of a tenancy at will.