Hi Linda, the best thing to do is talk to a mortgageprofessional. Your investment income may be sufficient if you are able to demonstrate that it's a continuing income allowing you to support the mortgage. I notice you are in AZ, if you need a Realtor in MD, please do not hesitate to contact me.
You will probably need to purchase with cash or with a major down payment unless you have a source of income. However, real estate has proven itself to be the best long-term investment around so it might be wise to move some funds in that direction.