sentences:  In 1999, residents of The Sentinels together with four other council owned estates, voted to transfer their homes into the ownership of an independent housing association, Optima Community Association.Optima then embarked on an extensive refurbishment programme as part of a wider regeneration scheme in the Attwood Green area in Birmingham.The project at The Sentinels involved replacing windows, kitchens, lifts, refurbishing the communal areas and improving security.