“租赁收入”常见的英文表达是 “rental income” 。
例句：
The company's rental income has increased steadily over the past few years.（过去几年里，该公司的租赁收入一直稳步增长。）
We rely on rental income to cover part of our living expenses.（我们依靠租赁收入来支付部分生活开支。 ）