In January Nikon added the Nikon 18-35mm f/3.5-4.5G ED AF-S NIKKOR to it's wide-angle zoom lineup. This lens is designed as a moderately priced alternative for full frame bodies like the D600. That is, this lens at $750 USD is less expensive than top 3 Nikon full frame wide-angle lens alternatives (14-24mm, 16-35mm and 17-35mm), but to get that lower you have to sacrifice some aperture and zoom range, which will enforce some wide-angle restraint on your shooting.
This lens will work on non-full frame bodies but becomes equivalent to 27-53mm which is not ideal for real estate.
I'm adding this lens to the PFRE lenses page as a choice for Nikon full frame bodies. The purpose of the lens page is to help real estate photographers decide which lenses to purchase for real estate shooting. The lenses page gives comparative ratings, Amazon pricing and a poll that now lists the shooting choice of nearly 2000 PFRE readers. I think the collective experience of 2000 PFRE blog readers is particularly valuable to making a lens choice. So if you haven't already participated in this poll please take the time to click the poll to tell us what you are using to shoot real estate. Also, if you think I've missed a lens that should be on the lenses page please let me know in the comments.