Waivo is an example of such company.

This is what my company does for our clients..

REI investing for almost 20 years, owning a wealth management company for 22 years, suffice it to say there has been a lot go data/spreadsheeting/tax analysis/meeting with my team go into this overall decision to sell the entire portfolio at once.  

Did you self manage or use a Property Management Company? 

My company provides an all-in-one solution for clients.

@Kyle Carter My top recommendation is to begin by contacting property management companies in each target area.

HELOCs are not available because they are residential loans guaranteed by individuals and what you seek is a type of commercial loan or credit line which are available to seasoned companies with proven financial track record.

You're using a company to manage tenant phone calls/inquiries and then send in vendors for repairs.

My company provides a comprehensive A-to-Z solution tailored to our clients' needs.

Many skip tracing companies have a minimum count or spend.