While Fara Espandi hasn't really done the research to full grasp what Universal Design is her article is an indication of just how far UD is penetrating the US housing market:
"As more members of the baby boom generation, which comprises the largest segment of America's population, reach retirement age, many of them show a preference for aging in place, in their own homes rather than moving to traditional assisted living communities," said ERA Justin Realtor professional Fara Espandi. "This trend has created more interest in the designing and retrofitting of homes for maximum ease of use. Heightened awareness of the needs of disabled people of all ages, and increased legislative attention to their rights, including the Americans with Disabilities Act (ADA), has also helped drive a trend which can benefit all homebuyers."
What has come to be called 'Universal Design' is a set of standards for making every house a welcoming home for inhabitants of all ability levels.