(Image source: pcmag.com) Trulia Inc (NYSE:TRLA), the real estate search engine was downgraded from buy to neutral by Goldman Sachs on the deteriorating macro picture of the housing market. In addition, Goldman believes that marketing efforts by Trulia’s main rival Zillow Inc (NASDAQ:Z) is taking mobile customers away from Trulia. As a result, the price target was lowered from $51 a share to $41. News of the downgrade is pushing shares 5 percent lower in current trading.