It was either a blockage caused by the tenant, or a main line blockage that may be a common line with some shared responsibility depending on the property and its rules.

This is also another reason I always do a move in inspection WITH the Tenant before handing over keys; and, why I take the time, during the signing of documents, to explain the repair request process and specific preventative steps they can take for items such as disposal blockages and other minor, routine, issues.

He was dead set against replacing it as it was up high on the hub where nothing was likely to get caught and cause a blockage.

Drain stoppages need to be documented by the plumber as to how far out the blockage was, what did they pull back, if anything.

This is a current blockage in the goal setting as I don't know how much knowledge transfers from single-family to multifamily investing.  

Right now the best views of the gulf are usually higher floors or units which have minimal view blockage of the gulf.   

And yes you should have your chimney professionally swept/cleaned to ensure there is no blockage or other surprises in there.

Everyone is buying the low-flow flush toilets now as a landlord to save on water.If the tenant pays water separately metered then you can leave the old ones in that use more.Some issues with the water saver toilets is that tenants hate them.They have to flush multiple times sometimes.I have found the key with toilets is to not buy the most expensive and not buy the least expensive.I do not like the floating ball valve assemblies.They can get stuck and keep the water running versus the newer kits.Also look for a toilet with a larger throat opening that goes into the sewer pipe.This will keep blockages from happening as that is where things get stuck the most before hitting the sewer line.Also pay special attention when you look at a model of a toilet on the display feel INSIDE of the toilet bowl when purchasing.Some manufacturers gloss coat the outside of the toilet but then use matte coating on the inside of the bowl.You want it nice and smooth on the inside of the bowl.This helps waste and paper slide down the bowl and through the throat into the sewer line without sticking.You can also stipulate in the lease that only toilet paper is to be put in the toilet.Anything else found with a blockage the tenant will be responsible for the repair and the damage.You can even have them sign an acknowledgement form on move in.

Kind of unusual but we will never have an issue with tree root blockages.

They are concerned there may be blockages in the "Main Line".