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Following university, Mercep spent six years working and travelling overseas, before returning to New Zealand in 1960. After working with KRTA, he entered into partnership in 1963 with Rodney Davies, Stephen Jelicich and Graham Smith to form what would become JASMaD (later Jasmax, one of the largest architectural firms in New Zealand).[1] In 1964, he became a registered architect in New Zealand. He helped design Hoani Waititi Marae in West Auckland and Waipapa Marae at the University of Auckland.[7] Mercep was project architect for Samoa House / Maota Samoa on Auckland's Karangahape Road, designed to house the Samoan consulate-general, and completed in 1978. The building won a New Zealand Institute of Architects national award in 1980.[8]
Waipapa Marae, University of Auckland
Karangahape Road elevation of Samoa House (centre left)