perpetual lease
A legal term for a leasehold with no fixed end date, often used in historical or property law contexts.
This land is registered as a perpetual lease.
定期借地 is a fixed-term lease, while 永代借地 has no set end date.
Compound of 永代 (perpetual) and 借地 (leased land). The exact historical derivation is uncertain; the term is used in Japanese property law.