With the large supply of new builds coming on the market at least in the near term, how would that impact the value of a new build I purchased now?

The only way for the equity and other asset classes to lose value rapidly is either the stop of liquidity (bank stop landing, people stop buying, or massive default) or all of sudden the money supply shrank due to governmental action like raise interest rate rapidly, etc.

If its a supply line, can do the same but shut off water first of course.    

Wrongful failure to supply heat, air conditioning, cooling, water, hot water or essential servicesAC is warranted.  

At the end there will be less rentals, which in turn will make rents even higher (supply/demand out of balance).So if you hang in there and deal with it, it might actually reward the leftover landlords with higher rent at the end. 

A quiet title action supplies its own basis - the purchaser has title to the property and asks the court to resolve all possible claims against it. 

@Kenneth LaVoie, with plumbing (NOTE: I am not a plumber) supply lines are easy, just make sure you have lots of glue if CPVC and know where the shutoff is if you are soldering, but there is not any concern of whether your lines are sloped up or down, since the water pressure makes it go where it needs to.On the waste side, just remember things flow downhill.

Supply seems to be extremely limited at the moment, but with high demand, driving prices up.

You must also supply a narrative that supports the comps in rebuttal to the comps used. 

Lastly, and I am just now going to this option, but instead of putting in cheap blinds on the windows (which I seem to be replacing every transition) putting up curtain rods over each window and either let the tenant supply the curtains or if your ambitious you put your own in.