Not sure if it's a good idea to have redirect link for SEO?

[ybing]

I made www.houseinannapolis.com for my friend. One question is I have the featured homes right now on that site. Since that needs to be updated and right now, I have all the listings hard written on the page, I am thinking about linking that to his listing page through his realty agency that automatically updates. So instead of having each listings, when visitors click on the tab on the left, it redirects to other site. Is this o.k. to.do? I really don't want this to affect negatively for SEO. Please advise.