If the blockage had been between the toilet in one unit and the main line, then you could narrow down who might have done it.  

I sell a properties all over Philadelphia, mainly for investment purposes.

With that being my main goal in finding buy and hold properties it’ll be a better use of time to look elsewhere.

That's the main thing I'm having trouble understanding. 

On another forum (bethepro.com), some others correctly pointed out that it's probably not a great idea to concrete around main water pipes / gas valves that are in some of these planters.

@Josh Wagner right now the main metric I pay attention to is my net monthly return through my real estate investments.

Our subgroup specifically meets on the first Tuesday of every month, with the "main" meeting occurring the following week.

@Steve VaughanOK, that's interesting, I managed to delete half my answer above.What I meant to say is that this would be such a useful trick to a DIYer because it means, on something like a simple gable roof like the one pictured, you could reshingle half the main roof in early September, tarp the ridge, wait out the winter, and then reshingle the other half in April.

Yes we would definitely at least make a couple hundred once we moved out so that’s my main concern.

@Khemaro Nuon the direct answer to this is "NO"...mainly because "delayed financing" is a Fannie Mae and Freddie Mac concept.