It depends on the situation, Brian. In many cases, the rental property is being purchased by another investor who finds having existing tenants to be a plus. In this case, there wouldn't be a need to offer any kind of incentives. If the buyer doesn't want to have the tenants, it's not uncommon to see a "buyout" of a month or two for the tenants though none technically is required. It's also not uncommon to see a landlord adjust the rent or make some other accommodation to allow for showings without having to obey the 48-hour rule for access to the property.