Eeeks!! that sounds horrid!! Well, from now on, I will only be buying eggs, I think! After my own shipped birds coming down sick, I don't want to deal with that again! I still don't know what my birds had, since they never had runny noses or eyes. As it is, I don't want to put them in with my layers-- even now that they seem "fine".
BAD words!!!! That's Coryza, and it's BAD, BAD, BAD. There is no real treatment, and you should completely decontaminate yourself before going near your birds. It can only be managed by culling, burning, etc.
There is very little you can do to protect your flock if you are sharing a premises. Ideally, you would get the vaccinations for Coryza and give all of your birds shots. 3 weeks later, do a round of boosters. This will protect any that haven't been infected. I'm not sure what else to tell you.
The landlord can put his on Duramycin to control the secondary infections, but they will always be carriers, even if symptoms cease. They will continue to infect other birds during their lifetime, even if they never have symptoms again. It's just the way this disease works. THIS is the disease I've heard stories of sooooooo many people bringing home to their birds after swaps, on their shoes, etc. THIS is the one I keep Oxine in my car for, to spray down my shoes if I forget my 'feed store shoes.' Start putting a tablespoon of apple cider vinegar in your water, and try desperately to avoid contact with the infected birds.
I'm so sorry! It's a terrible thing.