• Established in 1937, PHA is the nation's fourth largest public housing authority. Today, we own and operate more than 14,000 affordable housing units, serving more than 80,000 Philadelphians. PHA is also an award-winning housing and community • Offers a free mortgage calculator and gives information on the different types of UK mortgages. Use our Free Mortgage Calculator or our Free Mortgage Advisory Service. A mortgage advisor will find you the best mortgage to suit your circumstances. Free!