These include the large middle-class suburbs of Peoria, Mesa, Chandler, and Glendale; upscale Scottsdale; and the college area of Tempe which serves as home to Arizona State University. All areas are modern and generally lacking in historic interest, but keep in mind that Phoenix only had 100,000 residents in 1950.
do {} until ($false) is an infinite loop; it'll only exit if you use something like break, return or throw from inside the loop body. do { } until ($true) would execute the loop body exactly once (which would make the loop rather pointless.) It looks like what you intended to do was wait for a file to exist.
You can't use 'runas' directly in Powershell. Anyway as you know, Runas will prompt for a password. I have to take issue here. You can use RunAs inPowersShell and it can be easily made to not prompt for a password by using the /savecreds switch. It will prompt the first time and save the password in the users password store. The next time it runs you will not be prompted.