I have a code enforcement inspection each year and the biggest issue is usually smoke detectors and any other safety violations.

And two of the units don't have carbon monoxide or smoke detectors.

What types of routine or emergency maintenance will it need (water leaks / exterminator / smoke & CO2 detector maintenance / air filters / gutters / outside maintenance / paint / flooring / refresh between tenants, etc.).

@Timothy SkolrudId use Smoke bombs and if that didn’t get him out I’d send in a couple of angry Rottweilers

Then I ask things like why are you leaving your current apartment, how much were you paying, how long are you looking to stay, if they have any pets, do they smoke. 

Just do it.I literally just reversed the color scheme on a house and its like a salmon color.

What in the world are you smoking?

I have no dog in that fight but there is definitely a lot of smoke.

In my for rent ads, I post a little about my criteria and then ask if they smoke or have any animals. 

When you do your renewal, I think it would be worthwhile to review the important points you want to get across: no pets, no smoking, pay rent on time or consequences would be X, take good care of the house, you will respond in x amount of time for repair requests.