@dkidknow - I think the biggest limitation may be that you are likely sharing power, or at least ground, with other units. I've never done a room in a coop or multi-unit building but only in single family houses. The dedicated lines give you some assurance that there are no noise inducing appliances on the same circuit as your hi-fi gear, but they all source back to a panel which feeds other equipment and in turn is tied to a common ground. In one house, I could hear certain lights and appliances despite dedicated lines in a listening room on the third floor of the house, at a remove from the noise inducing appliances.
I was never too concerned about audiophile branded wire for the dedicated runs or even for the receptacles, going with 10 gauge and the Hubbell hospital grade receptacles I mentioned from Albert Porter.
Your question about addressing problems at the source would lead me to ask how the power to your unit is wired from the building's utility room-- something you are probably not able to change, but an inspection by a qualified electrician may be informative. I also don't know what code permits you to build in (e.g. an isolation transformer) as opposed to a "black box" that connects to the receptacle. The gent I mentioned in an earlier post in this thread, @jea48, has especially deep knowledge of code and best practices.