US investment house Invesco will take a half stake in the $800 million headquarters of resources giant Chevron in Perth, which is being developed by Canadian property giant Brookfield.

While Invesco emerged as the preferred investor in the landmark project in May last year and began due diligence then, it was not until this week that the agreement was finally announced as construction got underway. Financial close on the investment, struck on around a 5 per cent yield, is due in February.