Whether she is the only person on the deed or has to co-own with a parent, I think it's fantastic. I could see it being a point of potential concern for her tenants (who might worry about the maturity level of their landlord, or their ability to quickly address expensive repairs), but from a high-level mustachian perspective, I'm impressed and thrilled at the idea of a very young person investing and growing their assets. Further, even though she's doing something many adults have done before, the publicity is a great thing. When we promote young people doing responsible and mature stuff, I think everyone wins. Invariably, another young person (or their parents) out there will see this and it will set the wheels in their head turning... great stuff!