Spain's central bank says the Cajas savings banks have 217 billion euros in exposure to real estate and construction companies. Of this 100 billon euros is "potentially problematic." The Cajas have provisions for 38% of this. The government approved rules for minimum capital requirements. The capital ratios are set at 8% for all banks and higher for the Cajas. It said all banks will need to raise 20 billion euros by a September deadline. Barclays estimates this at 46 billion euros, twice the government estimate. The government will extend the deadline on a case by case basis, so that banks have until December 2011 to close sales of stakes to private investors.The government will then take stakes in the banks by September through the Fund for Orderly Bank Restructuring or FROB. After a 3 billon euro bond issuance in January 2011, the FROB has 4.5 billion euros on hand and a 3 billion euro credit line.