A property with central air can also be more attractive to potential tenants with allergies or respiratory issues.2️⃣ Deck/balcony: Having a deck or balcony is a luxurious feature that can give your rental property more appeal and could lead to higher rent rates.

There are different types of mold airborne strain and on surfaces.Some mold at elevated levels might not bother some and other people with allergies or other conditions could send them to the doctor with symptoms.You have to determine if it is mold the cause of it.

Allergies, bad respiratory reactions and such.  

Now if you had a building that was specifically designed to house people who had pet allergies and you took active steps to rid the building of these allergens, then you could refuse the ESA. 

Including if it makes it difficult to rent to people with allergies after a cat has been in there. 

And need some kind of allergy report of my plants

In fact, you probably see a higher count outside during allergy season.  

If you suffer from allergies though I've heard it can be brutal there bc it's so greenWhat about Philadelphia?

Likewise, if a home is 'pet-free' and has been prepared and marketed that way and I am required to accept a non-pet animal, I expect to be able to, in the future, market my house as pet-free, good for those with pet allergies. 

Often it's about allergies.