Fannie Mae plans to move its Dallas headquarters to nearby Plano, TX, and consolidate three area offices into one new location by sometime in 2018, thanks to an improvement in loan quality resulting in the need for less staff. The Dallas-based offices are focused on mortgage servicing, working with borrowers if they’re behind on their mortgages and managing foreclosed properties. But with foreclosures lessening, plans include downsizing office space from about 450,000 square feet to an approximately 300,000-square-foot office. “It’s important to have our teams in one place to do that work together,” said a GSE spokesman who confirmed the move.