Is gramercy publishing owned by random house?

Answer - Yes. It took me some time to research it. My first clue was the Wikipedia disambiguation page for Gramercy, listing as part of Random House (which if followed, displays the redirect at the top of the Random House page). I've since edited the Wikipedia page for Random House based upon the information I found.

While Surfing Random House, Inc.'s website, I came across their Copyright & Permissions webpage, and it was here I found the final confirmation:

Go to the main Random House website. At the very, very top of the page is displayed "Random House Inc. | More Sites +" Click on the plus-box for More Sites, and select "See all here" from under the heading Our Publishers.

You have now switched from Random House Inc.'s .com to their .biz site, and can find Gramercy Books is listed under Random House Value Publishing.