through these instruments rents are set belowmarket levels and the duration of contract is longer than what mandated by law for private rental contracts in exchange for rental income tax relief social rental agencies sras also take on this role in some countries sras are nonprofit organizations that act as intermediaries between private landlords and vulnerable tenants providing guarantees to the landlords typically rent payments management and administrative tasks and physical quality of the dwelling and support services to tenants evidence shows that landlords capture a sizeable share of public housing allowances by raising rents in finland kangasharuju viren france fack laferrere and le blanc the united kingdom gibbons and manning and the united states susin