他们购买了这栋办公楼的50年使用权。

They acquired a 50-year ___leasehold on the office building.

这份租约明确规定了租户每月需要支付的租金金额。

The ___leasehold clearly states the monthly rent amount the tenant must pay.

这套公寓是租赁产权，租约还剩20年。

The apartment is a ___leasehold with 20 years remaining on the agreement.