I know property managers in every state who use non-refundable application fees and it is the standard for every class of property and applicant.

Are you self managing those properties?

It's not quite as easy as renting out two sides of a duplex, but with the right marketing and management you could rent out the extra unit to supplement the mortgage payment. 

However, I don’t yet have the funds for a down payment on another house, and I’m trying to figure out the best option for where to live while I rent the apartment.Do you have any recommendations for managing this transition or tips on finding a temporary place to stay?

Do you work with a property manager or do you do everything yourself?

I'm managing D class properties with a property manager and am making a profit. 

Yup, property condition, vintage, neighborhood, tenant base, property management are all very important considerations. 

I would be interested in connecting for the Washington team position for both purchasing agent and professional property management.

@Isla Arshad,  you've described the experience of many landlords who manage their own properties.

Logical Property Management are actually my property managers.