49 Pa. Code § 9.64
An architect who maintains a permanent address outside of this Commonwealth may practice architecture in this Commonwealth if the filing and ownership requirements of sections 7(b) and 13 of the act (63 P. S. §§ 34.7(b) and 34.13) are complied with, and if the sole owner of a sole proprietorship firm, a partner of a partnership firm, a member of a professional association, a shareholder of a professional corporation or a member of the board of directors of a business corporation who is also a shareholder in that corporation is a registered architect in this Commonwealth. The architects shall assume full responsibility for the projects in this Commonwealth.
49 Pa. Code § 9.64
The provisions of this §9.64 amended under sections 5(a), 6(a), (c) and (d), 8(b) and (c), 10(b), 11(a), 12(a) and (c), 13(h) and 14 of the Architects Licensure Law (63 P. S. §§ 34.5(a), 34.6(a), (c) and (d), 34.8(b) and (c), 34.10(b), 34.11(a), 34.12(a) and (c), 34.13(h) and 34.14).