Beginner with 2 Res and 2 Comm properties - What to do next?

[Brendon Burke]

34 year old new here and to real estate. I bought 2-300 sq. ft. comm and 1-700 1 bed condo 2 years ago and 1-680 sq. ft. 2 bed condo in May, have about 380k in debt (25 year fixed loan) and about 250k in equity in the units. Units cash flow and are in a small resort town where real estate is booming. Residential condos are selling for $400+ sq ft. and no new builds will happen ever as town is surrounded by non-develop-able land. Looking at maybe going out of state and buying bulk single family or an apartment building. I own a business and make about 250k/year business is worth 1 million if I were to sell. Would like to sell biz in the next 9-10 years as it takes a lot of my time but money is good. Would like to be financially at 43 and live on rents.

What should I do to expand my portfolio so I can get out of my biz?