三者是指不同类型的净租赁。

净租赁（Net Lease——The term net lease refers to a contractual agreement where a lessee pays a portion or all of the taxes, insurance fees, and maintenance costs for a property in addition to rent. Net leases are commonly used in commercial real estate.）:根据这类租赁合同，房客在支付固定月租后，还要负担一部分费用。这类租约按承担费用的范围：维护费、税费及保险，分为三种：单净租赁（Single Net Lease）、双净租赁（Double Net Lease）和三净租赁（Triple Net Lease）。

单净租赁（Single Net Lease——A single net lease is a commercial real estate lease agreement in which the tenant agrees to pay property taxes in addition to rent. ）：房客只支付房租和房产税。

双净租赁（Double Net Lease——A double net lease is a rental agreement whereby the tenant agrees to cover the costs of two of the three primary property expenses: taxes, utilities, or insurance premiums.）：房客要支付房租、房产税和保险。

三净租赁（Triple Net Lease——A triple net lease (triple-net or NNN) is a lease agreement on a property whereby the tenant or lessee promises to pay all the expenses of the property, including real estate taxes, building insurance, and maintenance.）：房客除要支付房租、房产税、保险外，还要支付日常运营费用。对于房东来说，就像买了一只债券，每月坐收“利息”就好了。

以下为相关双语示例，供参考：

Many real estate investors think nothing could be simpler than an investment in a triple-net-leased (also known as NNN) property. Some liken it to buying a bond. While straightforward to own and operate, triple-net-leased properties can be the most challenging type of real estate investment for advisers to structure or — if the lease already exists — to understand. With lease terms as long as 50 or more years when options are taken into account, due diligence is critical, as changes usually cannot be made later on.

许多房地产投资者认为没有什么比投资三净租赁的房产更为简单了。一些人把它比作购买债券。尽管三净租赁房产持有和运营起来很简单，但对于顾问来说，三净租赁房产可能是最不好构建或——如果租赁已经存在——最不好理解的一种房地产类型了。考虑到租赁期限在50年以上，在做选择时尽职调查至关重要，因为此后通常无法进行更改。