And have no water pressure anywhere else.

And if you don't discharge the house water, and nothing leaks, there's no pressure differential when you turn the meter cut-off on and off. 

Because they will get defensive if they feel you are pressuring them.

I’m feeling pressure to get it back on the market ASAP because the uncertainty of America right now.

This is not due to manager pressure or anything - just my personal feeling). 

The multiple water leaks and signs of structural issues are also concerning.I always ask the listing agent for the age of the roof & mechanicals upfront and if possible view the roof from the ground to gauge condition so there aren't any surprises.

Find yours and use that as your gauge.

The increased rates are putting downward pressure on the market, so I believe sellers are becoming more open to other types of financing since homes are starting to see more days on market and sellers can become more “desperate” to sell.4.

Do I fix the water pressure regulator gauge now ($350 in each unit) or wait and see if it causes leaking later?  

Those questions help me gauge her income.