leaseLength

This term is proposed for full integration into Schema.org, pending implementation feedback and adoption from applications and websites.

Thing > Property > leaseLength

Length of the lease for some Accommodation, either particular to some Offer or in some cases intrinsic to the property.
Values expected to be one of these types
Duration
QuantitativeValue
Used on these types
Accommodation
RealEstateListing

Source

https://github.com/schemaorg/schemaorg/issues/2373