PORTLAND, Ore., May 21, 2019 /PRNewswire/ -- Mastering The Art of Commercial Real Estate Investing:  How to Successfully Build Wealth & Grow Passive Income from Your Rental Properties by Doug Marshall, CCIM (Morgan James Publishing, 208 pages, Trade Paper, 2019, $16.95; ISBN: 978-1-64279 015-3) lays out the time-proven strategies of an experienced commercial real estate investor and mortgage broker to help others attain financial freedom. Do you want to supplement your current income by investing in commercial real estate (CRE)? Better yet, would you like to someday quit your day job and devote your energies exclusively to your rental properties?