A team of five staff, headed by director Dave Chapman, has joined JLL's affordable housing team and will continue to work from its home in the city and base in Bristol.
Established in 2001, the consultancy provides valuation and surveying services to the social housing sector and this acquisition by JLL follows a number of other growth initiatives.
Ian Cornock, lead director for the Birmingham office of JLL, said: "They will bring a new and important regional dimension to our residential capability and also bring new client relationships to the table.
"Being able to offer our clients a truly comprehensive, national service is increasingly important as clients' requirements grow and the market looks for advisers with true breadth."
Glen Jones, partner and head of housing at Mazars, added: "There is a synergy between audit and advisory services and property consultancy.
"Following the successful conclusion of this transaction, Mazars and JLL have agreed to develop a strategic alliance which we are confident will enhance the offering of both firms in the housing sector."
In addition, JLL has announced that Shuab Mirza will also be joining the valuation team from Countrywide Social Housing.