Search online for schools that offer associate's degrees in property management. There are many websites to point you in the right direction, although a simple word search will usually be sufficient to bring up several options. Look through the schools' websites and find the ones that appeal to you.
Check that the schools that interest you are accredited through a recognized accrediting body, such as the National Education Association, nea.org. Most of the schools will list this information prominently on their sites.
Contact the schools directly and ask for information on their property management programs. Also ask about admissions policies, cost and payment options. See if they can provide references for their degree program and if you can contact former students. Some schools may have testimonials available on their website.
Visit a campus of the online school that is local to you. Many online schools maintain physical campuses and you can gather further information about the school and their property management program through a visit.