The Mayor and City Council of Baltimore City or the governing body of a county or of a municipal corporation may grant, by law, a property tax credit against the county or municipal corporation property tax imposed on that portion of real property, including any improvement, that contains an area set aside and dedicated exclusively for a day care center that is: registered as a family child care home or large family child care home under Title 9.5, Subtitle 3 of the Education Article; licensed as a child care center under Title 9.5, Subtitle 4 of the Education Article; licensed as a day care center for the elderly under Title 14, Subtitle 2 of the Health – General Article; or licensed as a day care center for adults under Title 14, Subtitle 3 of the Health – General Article. The amount of the annual credit may not exceed $10,000 or the amount of county or municipal corporation property tax attributable to that portion of property for which the credit was granted, whichever is less. Subject to subsection (b) of this section, the Mayor and City Council of Baltimore City or the governing body of a county or municipal corporation may provide, by law, for: the amount of the property tax credit under this section; the duration of a property tax credit under this section; and any other provision necessary to carry out this section. A credit under this section may not be granted if the real property qualifies for a credit under § 9–214 of this subtitle.