For adult children, we typically do a background check but don't run their credit or use their income to qualify.

It's a good idea to do limits, not necessarily a 90lb lab, which should have an adult weight of 70lbs but a Great Dane that has an adult weight of 120lbs.

Five unrelated adults sharing a kitchen is a challenge. 

Treat people like responsible adults who are able to problem solve, come up with solutions and keep on top of their obligations.

They are a 2 parent household with two children under 10yrs old, no pets, both adults are working and have been living in this building I bought for years.

In my area, that includes the following:Race, Color, Religion, Sex, Familial Status, National Origin, Disability, Military Status, Sexual Orientation, Age, Creed, Marital Status, Gender Identity, Source of Income, Immigration and Citizenship StatusBeing 19 y/o, the tenant is feels that this is unfair treatment based on age.

Our own youth (and a growing number of adults) seem to think everyone has a right to be middle-class without putting in the effort.

The adult would also require a bedroom for another 80 - 100 sq.ft.

So far it hasn't been used for multiple adult roommates. 

You can rent out the place for a set for filming adult movies.