Unconventional is anything that is not underwritten in a conventional manner. A situation where you inherit a property and take out a mortgage to pay out others with shared inheritance in a property is almost certainly not representative of the underlying reason for the growth in the 3%. If the author is trying to imply a rebirth in reckless lending that caused the last recession then I'm arguing they picked the wrong subject. If it's because they couldn't actually find a subject that definitely should not have been given a mortgage then the entire premise of the article is wrong.
It says at the end, she'll rent out the rooms. San Clemente is in prime beach front Orange County. 1) She will be able to rent a single room for at least $750-$1000. 2) The property is in a highly desirable, wealthy area and will likely continue to grow in value over time. 3) Her earnings will grow over time once she graduates.