Blaha is the CEO of Dostupné bydlení (Affordable Housing) at Česká spořitelna and the leader of the Affordable Housing Working Group at the Czech Banking Association (CBA). Under his leadership, the company has invested in 700 affordable rental housing units for public service professionals. Marek has also worked as a financial sector expert with the government on behalf of the CBA to establish a newly introduced state framework for the affordable housing sector in the Czech Republic.