Foreign participation in architectural service companies is limited to minority shareholding.
"2. In this Act, unless the context otherwise requires-[...]
"foreign firm" means a firm registered under Section 16 of this Act whose majority shares are owned by non-citizens;
[...]
13.(1) A foreign architect or quantity surveyor shall not practice as an architect or quantity surveyor in Tanzania unless he is registered under this Act.
(2) A foreign architect or quantity surveyor who wishes to be registered under this Act shall satisfy the Board that-[...]
(e) in the case of a foreign firm, is a firm that has employed foreign persons whose qualifications and skills are not available in Tanzania and has entered into a joint venture agreement with a local firm for carrying out the specific assignment;
[...]
16.(1) A foreign firm shall not be registered as a local architect or quantity surveyor or allowed to form a local firm unless-
(a) in the case of a  firm, it is registered in Tanzania and the majority of the shares are owned by the citizens of the United Republic of Tanzania; and
(b) at least one of the foreign principals is practising in Tanzania.[...]" (ARCHITECTS AND QUANTITY SURVEYORS (REGISTRATION) ACT, 2010)
ARCHITECTS AND QUANTITY SURVEYORS (REGISTRATION) ACT, 2010
[<a href="https://www.aqrb.go.tz/uploads/publications/en-1604923201-Act_no_4_of_2010.pdf">Act</a>]