It looks as if Google Base is experimenting with the Google's main serach results. The GoodROI raises its fingers to the present query that has put the Base listings to appear right on top of a Google SERP.
Since Google showcases already three paid listings on the top of the search results, it would be amazing if more pages on real estate would be added to a search box for the real estate listings in Google base.The idea of adding a Google Base search box in the their SERPs seems to be pretty appealing.
But it is stated that Google Base is still free to make any additions in the revenue. No matter what, but for Kidmurcury, a blogger, the act would simply be useless, till the day Google lay down a proper network for advanced search techniques. Whatever, the outcome be, go ahead with your beta test Google.