Dogs return to where they smell their own scent or another dog's... if you move the poo to the neighbor's site/space/doorway... that's where the dogs will go in the future.

There are also products that you can buy that repel dogs/cats from the areas they have been visiting. Cats are easier, as you don't have to buy expensive stuff... good cayenne pepper sprinkled around will teach them (they lick their paws and remember where they were..lol) Even cheap moth balls thrown in the parking area (esp if you can do this right before they go out) will deter them.

IDK where I live there is not only a leash law, but a pick up after law...

hope you figure something out...sure wish the landlord would help with it. TC!