That's really not high. Once the ammonia starts coming down your nitrites will start coming down as well. after that, the nitrates will follow. Give it a good 3 or 4 weeks, in my experience.
If you don't have any fish in the tank, you can bump your temperature up to about 85 or 88 to help it along a little bit. Don't do any water changes, and just let it cycle. I had a bin of live rock that I just finished cycling and it took about 4 weeks but my nitrates were still pretty high, even though the ammonia and nitrite were 0. I discarded the water and used the rock. I was able to do it a little bit early in the cycle, only because I already had a whole tank full of live rock that I was using to upgrade. I have about 130 pounds of cycled live rock vs 20 pounds of partially cycled rock.