Section 23001 shall apply with respect to all liabilities, debts, obligations of, and claims against, a real estate investment trust arising after the effective date of this part, and prior law shall continue to govern with respect to liabilities, debts, obligations and claims existing on the effective date of this part. No implication shall be created by the adoption of this part that the holders or owners of shares of beneficial interest in business trusts which do not meet the definition of real estate investment trust in Section 23000 are, or are not, as such, personally liable for the liabilities, debts or obligations of, or claims against, any such trust.