Neighboring fourplex putting large trash in front of my property

[Keaton M.]

The neighboring fourplex keeps putting mattresses in front of my property. It’s a shared spot for trash pick up but makes my place look bad when there’s a mattress sitting there getting nasty. There were about 6 mattresses there for at least four months until bulk pick up came. Two weeks later, there’s more mattresses. I’m not sure which tenant it is though and I’m assuming it’s that property. I’m not sure how to approach this. Do I go to the tenants, landlord, or the city?