Capital in an architecture firm must be distributed in a way that guarantees that licensed individuals possess a 2/3 majority. To enroll in the order of architects, Italian citizenship or other citizenship under the condition of reciprocity is required.
"Art. 7. 
The application for registration in the register must be submitted to the presidency of the order, drawn up on L. 2 stamp paper and equipped of the following documents: 
a) birth certificate;  b) certificate of Italian citizenship, or the certificate of State having reciprocity treatment with Italy; [...]" (ROYAL DECREE of 23 October 1925, n. 2537, "Approval of the regulations for the professions of engineer and architect"; last amended by DECREE OF THE PRESIDENT OF THE REPUBLIC 8 July 2005, n. 169; Article 7 [google translation])
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"Art. 10 
Reform of professional associations and professional partnerships  [...]
4. They can assume the status of a company between professionals company whose deed of incorporation provides: 
a) the exclusive exercise of the professional activity from part of the shareholders; 
b) the admission as members of professionals only enrolled in orders, registers and colleges, even in different sections, as well as citizens of the Member States of the European Union, provided that in possession of the qualifying qualification, or subjects who are not professionals only for technical services, or for the purpose of investment. ((In any case, the number of professional members and the participation in the share capital of professionals must be such as to determine the majority of two thirds in the resolutions o decisions of the shareholders; the absence of this condition constitutes cause of dissolution of the company and the council of the order of professional college in which the company is registered proceeds with the cancellation of the same from the register, except that the societa 'has not catered for restoring the prevalenza of the soci professionals within the peremptory term of six months)) ;[...]" (LAW of 12 November 2011, n. 183, "Provisions for the preparation of the annual and multi-year budget of the State (2012 Stability Law)"; last amended by LAW of 30 December 2018, n. 145; Article 10 [google translation])
ROYAL DECREE of 23 October 1925, n. 2537, "Approval of the regulations for the professions of engineer and architect"; last amended by DECREE OF THE PRESIDENT OF THE REPUBLIC 8 July 2005, n. 169; Article 7
LAW of 12 November 2011, n. 183, "Provisions for the preparation of the annual and multi-year budget of the State (2012 Stability Law)"; last amended by LAW of 30 December 2018, n. 145; Article 10
[<a href="http://www.normattiva.it/uri-res/N2Ls?urn:nir:stato:regio.decreto:1925-10-23;2537!vig=2021-08-23">Decree</a>],[<a href="http://www.normattiva.it/uri-res/N2Ls?urn:nir:stato:legge:2011-11-12;183!vig=2021-08-23">Law</a>]