Authorizing a person who offers for sale to a third party improved single-family residential real property, for the first 30 days, to accept an offer to purchase the property made only by an individual, a community development organization, a nonprofit organization, or a real estate enterprise that owns an interest in less than 3% of all residential real property in the county; and altering the rate of the State transfer tax payable for an instrument of writing for a sale of certain residential real property under certain circumstances.