Amazon is adding $1.4 billion to a fund it established three years ago for preserving or building more affordable housing in the regions where the company has major corporate offices. The Seattle-based company said the new sum would go on top of the $2.2 billion it had already invested to help create or preserve 21,000 affordable housing units in the three areas. They include the Puget Sound region in Washington state; Arlington, Virginia; and Nashville, Tennessee. The additional money in Amazon's Housing Equity Fund will go to the same regions. Amazon launched the fund following years of...