When a rental sits empty, it doesn’t just collect dust—it costs money. Every day a unit sits without a tenant, the owner loses income, and in some cases, it can mean hundreds or even thousands of dollars a month. That’s why Portland rental management companies work hard—and smart—to get the word out and fill vacancies fast. But how exactly do they do it? Spoiler: It’s a lot more than just putting up a “For Rent” sign.