Just moved there myself three months back. Usually train in my home gym but was in temp housing until now. I highly recommend checking out Armbrust is Wheat Ridge. Has everything. Three squat racks, oly platform, mono-lift, prowler, tires, huge selection of bodybuilding machines. And to top it off a dedicated leg room.
People are awesome and it is inspiring to train there. I am just a bit below average size there.....average size of the women that is (I am 6'2" 205 lbs male).
That last bit is hyperbole. You will find bodybuilder beasts, fitness athletes, power lifters and amateurs like myself. Good luck wherever you end up.