All taxable real estate, having been segregated for and made subject to local taxation only by Article X, Section 4 of the Constitution of Virginia, shall be assessed for local taxation in accordance with the provisions of this chapter and other provisions of law. For purposes of the assessment of real estate for taxation, the term “taxable real estate” shall include a leasehold interest in every case in which the land or improvements, or both, as the case may be, are exempt from assessment for taxation to the owner. The provisions of this chapter relating to the assessment of real estate shall not apply to property required by law to be assessed by the State Corporation Commission or the Department of Taxation.