To learn the basics about these accounts, check out “Introducing the Solo 401k: The Perfect Retirement Account for Investors.”What Are the Advantages of a Solo 401(k)? All expenses related to your solo 401(k) real estate purchases must come from your retirement account. Investing in Real Estate With a Solo 401(k)To start using your solo 401(k) to invest in real estate, there are six steps to take. Solo 401(k) Investment ProcedureStep 1: Open a solo 401(k) account. Solo 401(k) Real Estate Tips to Stay IRS CompliantRemember, 401(k)s are funded in various ways.