At the state House of Assembly, he served in various capacities, as a member of committees such as the Committee on Lands and Housing as well as several physic Planning, to mention a few. He served as the chairman of the House Committee on Rural Development, and for six years as a pioneer chairman of the House Committee on Public Accounts (Local Government) He was also the chairman of the House Committee on Budget and Economic Planning of Lagos. Under his leadership as the Chairman of the Public Accounts (Local Government) committee, the ratio of recurrent expenditure to capital expenditure was reviewed in favour of capital expenditure for our local governments and local council development areas (LCDAs) to witness a rapid infrastructure development.
Likewise, sanity was brought to the financial transactions of all LGs and LCDAs in the state.
He first contested elections as a local government delegate to the state Congress during the Social Democratic Party (SDP) era to elect the party’s candidates. He was elected a zonal chairman under the UNCP for Alaagba Zone, Agege. He became a member of the Ward Executives for Ward E, Agege local government during the UNCP era. He served as the chairman of the Campaign Committee for Local Government Election for the Alliance for Democracy in Agege local government until he was himself elected a councillor in ,1999. Obasa has attended both local and international trainings and seminars. He was at the prestigious Cambridge University, United Kingdom, for much coveted leadership training and also Slough University in the United Kingdom for managerial capacity building training.
He similarly attended the prestigious National Conference of State Legislators (NCSL) in the United States. Obasa had the benefit of attending yet another prestigious training session on lawmaking at the British parliament and at different times attended the Conference of Commonwealth Parliament programmes both at the international and continental levels.
He equally had the rare privilege of being awarded a Certificate of Excellence by the State of Georgia in United States in recognition of his outstanding contributions towards the development of democratic processes in Lagos state in particular and Nigeria in general .