Question

ازدواج با او

Answer 1

While defining the lease terms and conditions, try to find a firm foothold for yourself to safeguard the capital or the asset you have allocated to someone else's property.

Answer 2

Secure your position / rights within the lease contract terms & conditions and keep the capital / expenses , which you (may) spend on / bear for (maintainance) of the other person's  / owner's property / estate harmless of any damage. / any loss.