De or het leaseperiode?

The correct Dutch article is:

de leaseperiode

Rule Words ending in -ode: always de. See the rule

How to use leaseperiode

the leaseperiodede leaseperiode
this leaseperiodedeze leaseperiode
that leaseperiodedie leaseperiode
our leaseperiodeonze leaseperiode
your leaseperiodejouw leaseperiode
every leaseperiodeelke leaseperiode
which leaseperiode?welke leaseperiode?
a big leaseperiode / the big leaseperiodeeen grote leaseperiode, de grote leaseperiode