No level of government should have a right to require that private existing residential properties be made accessible to people with disabilities at any time, including during a sale of the property. Neither should they have the authority to demand that any other property (either new residential or existing or new commercial) be made accessible to people with disabilities unless more than one percent of the total population share some disability that would benefit from the mandates.
In addition, no level of government should be allowed to mandate the use of any resource efficiency device, like low-flow toilets or showerheads. Governments could encourage the use of certain devices, but it should always be left up to the consumer to decide how efficient they choose to be. If resource prices are set correctly, then nobody should care how much somebody chooses to waste.