Only locally licensed individuals, i.e. 'architect', shall become partners and hold equity share in architect firms According to the Architects Act, No person (individual, company, LLP, etc.) other than an Architect or a Firm of Architects (having only Architect partners) shall use the title and style of 'Architect' for practicing the profession of an 'Architect'. However, qualified foreign architects are entitled to be registered as an Architect in India subject to reciprocity (Section 25(c)(a) of Architects Act 1949).
"15. Recognition of architectural qualifications granted by authorities in foreign countries.—(1) The Central Government may, after consultation with the Council, direct, by notification in the Official Gazette, that an architectural qualification granted by any university or other institution in any country outside India in respect of which a scheme of reciprocity for the recognition of architectural qualification is not in force, shall be a recognised  qualification for the purposes of this Act or, shall be so only when granted after a specified date or before a specified date: 
Provided that until the first Council is constituted the Central Government shall, before issuing any notification as aforesaid, consult the expert committee set up under the proviso to sub-section (2) of section 14. 
(2) The Council may enter into negotiations with the authority in any State or country outside India, which by the law of such State or country is entrusted with the maintenance of a register of architects, for settling of a scheme of reciprocity for the recognition of architectural qualifications, and in pursuance of any such scheme, the Central Government may, by notification in the Official Gazette, direct that such architectural qualification as the Council has decided should be recognised, shall be deemed to be a recognised qualification for the purposes of this Act, and any such notification may also direct that such architectural qualification shall be so recognised only when granted after a specified date or before a specified date. 
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CHAPTER III - REGISTRATION OF ARCHITECTS
23. Preparation and maintenance of register.—
(1) The Central Government shall, as soon as may be, cause to be prepared in the manner hereinafter provided a register of architects for India.
(2) The Council shall upon its constitution assume the duty of maintaining the register in accordance with the provisions of this Act. 
(3) The register shall include the following particulars, namely:— (a) the full name with date of birth, nationality and residential address of the architect; [no citizenship requirement]
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25. Qualification for entry in register.—A person shall be entitled on payment of such fee as may be prescribed by rules to have his name entered in the register, if he resides or carries on the profession of architect in India and—
 (a) holds a recognised qualification, or
 (b) does not hold such a qualification but, being a citizen of India, has been engaged in practice as an architect for a period of not less than five years prior to the date appointed under sub-section (2) of section 24, or 
(c) possesses such other qualifications as may be prescribed by rules: Provided that no person other than a citizen of India shall be entitled to registration by virtue of a qualification— 
(a) recognised under sub-section (1) of section 15 unless by the law and practice of a country outside India to which such person belongs, citizens of India holding architectural qualification registrable in that country are permitted to enter and practise the profession of architect in such country, or 
(b) unless the Central Government has, in pursuance of a scheme of reciprocity or otherwise, declared that qualification to be a recognised qualification under sub-section (2) of section 15. 
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37. Prohibition against use of title.—(1) After the expiry of one year from the date appointed under sub-section (2) of section 24, no person other than a registered architect, or a firm of architects shall use the title and style of architect: Provided that the provisions of this section shall not apply to— (a) practice of the profession of an architect by a person designated as a “landscape architect” or “naval architect”; (b) a person who, carrying on the profession of an architect in any country outside India, undertakes the function as a consultant or designer in India for a specific project with the prior permission of the Central Government. [...]" (THE ARCHITECTS ACT, 1972 , as amended)
THE ARCHITECTS ACT, 1972 , as amended
[<a href="https://www.indiacode.nic.in/handle/123456789/1690?view_type=browse&sam_handle=123456789/1362">Act</a>]