Sounds like the same **** I went through when I lived in an apartment for 6 years.
I had kids at the time and my DH (Fiancee at the time) had just moved in with me.
We constantly had clothes stolen - mostly the baby/kids clothes.
After many complaints to the resident manager (who pretty much just rolled her eyes at me) and calls to the police (who told us that they had more important things to do), Todd started breaking the rules by doing the laundry at 3 - 4am in the morning (not supposed to start until 7).
People complained to resident manager on US... which they got the same reply (rolls eyes).
Now Todd's used to doing laundry at 4 am in the morning and it's always finished by the time i get up in the morning
Ahhh I know how to train-em.