Any persons who are now or who have heretofore been voluntarily associated together for the transaction or doing of business under and pursuant to the terms and provisions of a declaration of trust or articles or agreement of association, commonly designated as a Massachusetts trust or business trust, or any other lawful voluntary association by whatever name known, may purchase, acquire, hold, deal in, sell, lease, convey, exchange, pledge, mortgage and encumber any real estate or personal property or interest therein within this state, and may execute all deeds, leases, contracts, or other instruments in writing with respect to real estate or personal property or interest therein as may be necessary or required, either in the name or names of the trustees for the time being designated in such declaration, articles or agreement, or their successors, or in the name or names of another person or persons designated in such declaration, articles or agreement, or by a descriptive, assumed or trade name, when signed by a duly authorized officer or officers thereof, all as may be provided for and stated in such declaration, articles or agreement: Provided, That such association or trust shall have qualified to do business in West Virginia, as hereinafter provided for in sections two and three of this article.