I have some new tenants of a few months and we're having crazy moisture issues. They have complained about mold growth inside the apartment. I have found the humidity their cooking to be the cause. I've seen about 75% humidity indicated by a humidistat. Been dealing with this for a few months, the roof, plumbing, walls are sound. The mold/water wipes off easily.
I've set them up with a portable dehumidifier, they are using the power wall vent next to the range. The tenants are Latino and definitely are cooking alot, seem to like to boil things. I did ask her if she is cooking for others and she told me just for the four residents. (I have no reason not to believe her)
This is a brick two story duplex circa 1954', I've owned for pushing 15 years. I've personally lived in both units in the past and have never had moisture issues in either apartment.
I'll try to post a few pics of the wet walls I found today. Also on today's inspection, I found several windows wet on the insides. Wet window sills, even the blinds are wet.
I'm at the point where I'm going to have to ask them to leave as I simply don't know what else I can do. Language has been a bit of a issue too, I do use a translator app.