Demised premises
Premises which are the subject of a lease.

Derogation from Grant
An obligation on the landlord not to take away with one hand that which he has given with another (eg storing explosives next to the tenant's premises!)

Determination
The bringing or coming to an end of a lease, or an estate or interest in property, especially by notice as expressly provided for in the lease or as a consequence of a fundamental breach of a lease condition. See also termination.

Discounted cash flow
An investment appraisal technique which takes account of the time value of money by assessing the present value of future income and expenditure. It is often used in valuing an investment or to show the viability of a project.

Distraint
The enforcement of distress for rent.