Without going into too much detail, we had a mid-rise apartment building in our downtown collapse a little over a year ago which very sadly killed 3 of our residents.

The one's that struggled or collapsed tended to run very tight on cash flow. 

Depending on what the line looks like (i.e. if it's just a small gap in a joint/imperfection in the line that the roots are growing in, and not that a whole section of the line has collapsed or anything like that) then you can probably try this first before replacing the line.

The 1920s in Florida was a time of excess, immense wealth, and precipitous collapse.

Same for a collapsed sewer pipe - they won't pay for the repair to the pipe, but they do need to pay for the damages caused to access that pipe like removing flooring, drywall, concrete, etc.

No mortgage would help me weather a storm if a bad renter or economic collapse set in  

There appeared to be a cracked and collapsed pipe around 35 feet.

From a logical perspective it's gotta be this way, otherwise the best strategy becomes max leverage all the time no matter what and the currency collapses.

We are riding from cap 9 market to cap 3 market, everyone in BP that invested in 2009 is rich enough lol.Now................ the difference is the effect of asset when financed with short term debt vs very long term debt.With very long term debt like residential we have reduced appreciation rate in different market (from -2 to 6% market)to a collapsed of valuation (in CRE using short-term floating) with (DE-)appreciation from -10 to -30%( one 100 bps changes in spread causing a decline of valuation to 10-15% and/or 10-15 DSCR from my napkin calculator ).

Look up my history, look back to what I was WARNING early into covid, of no collapse, of no don't wait for some BS "reset" buy now or cry later.