So I'm a journeyman plumber about to take the master plumbers exam.

No.I'm looking into a Master policy.

He ended up losing a great deal of the properties because they were leveraged.Thanks for your comment Robert,I've been a "Debbie Downer" on folks using leverage when investing.Leverage is a craft that takes years to master and it should only be used by more experienced investors.Nothing comes easy in life and neither does building a large real estate portfolio.Leverage isn't the answer IMOMuch success

Remodeled kitchen, bathrooms and turned two rooms in to a Master sweet with walk in closet.

@Ernesto Gaxha, what you are describing is similar to Master Subleasing, I might have that name incorrect.  

This is SUCH a good question and often a stumbling block for Solo 401k investors so great to get expert help like you've gotten here from Brian, Carl and Dmitry.You can use almost any brokerage account with your Solo 401k including:Schwab: they call it a Company Retirement Account as Dmitry mentionedFidelity: non-prototype retirement accountTD Ameritrade: trust accountRaymond Jones: varies from branch to branch, but usually called a Master accountE*TradeVanguard: they have different accounts for mutual funds or ETFs/equities but definitely availableInteractive Brokers: Trust accountFor banks, we've found the following are familiar with/supportive of Solo 401ks:Titan Bank: FDIC insured, based out of Texas, clients in all 50 states, free checks, free debit card, no monthly fees if you keep $1500 in the account, online banking, etcSolera Bank: like Brian recommended, FDIC insured, based out of Colorado, clients in all 50 states, free checks, free debit card, no monthly fees (for certain clients), online banking, etcTD Bank: a particular branch in New Jersey (strangely enough!)

Some highlights include:• Multiple degrees - I recently completed a dual Masters program focused on Business Leadership and Dispute Resolution •Professional property management experience •Detailed oriented•Trained Mediator with experience in Landlord-Tenant, Neighbor-Neighbor, Small Business disputes• 5 years of Project Management experiencePlease feel free to connect with me to see if an opportunity exists to work together!

Sqft was greater than listing showed Upgraded half bath in master to a full bathOpen concept kitchen What was the outcome?

Before I start my discussion I preface this information: Coming from a Master Electrician Licensed in New Hampshire, Massachusetts, Maine and Vermont, acknowledging the fact that other states may or may not follow the same promulgated regulations; may or may not be under the same requirements; ultimately the answers you may need or want should come from the Authority Having Jurisdiction (AHJ) in your region.

Master BR is only 11x 11.