A man walks with his dog outside Bank of Portugal in downtown Lisbon, Portugal, February 21, 2017. REUTERS/Rafael Marchante/File Photo Acquire Licensing RightsLISBON, Nov 15 (Reuters) - The Bank of Portugal has told Millennium bcp (BCP.LS), Novo Banco, Banco BPI and the local unit of Spain's Santander (SAN.MC), to create a new capital buffer equivalent to 4% of their loan portfolios that are collateralised by home mortgages. It said in a statement on Wednesday the measure addressing "sectoral systemic risk" would come into effect on Oct. 1, 2024, and be reviewed at least every two years. "This instrument has a preventative nature and aims to increase the resilience of institutions in the face of a potential future materialisation of systemic risk in the residential real estate market in Portugal," it said. BPI is owned by Spain's Caixabank and Novo Banco by the U.S. fund Lone Star.

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Persons: Rafael Marchante, Spain's Caixabank, Sergio Goncalves, Andrei Khalip Organizations: Bank of Portugal, REUTERS, Rights, Bank of, bcp, Novo Banco, Banco BPI, Spain's Santander, BPI, U.S, Lone Star, Thomson Locations: Lisbon, Portugal, Rights LISBON, Bank of Portugal, Novo