Looking to buy
your dream home?

We know that purchasing a home can be overwhelming. That's why we make the loan process as easy as possible and make sure you get the best rate!




Welcome to Mason-McDuffie Mortgage



Welcome, and thank you for visiting JM Loans, your direct access to John Meussner, one of the nation's leading mortgage bankers!

Over the years we've learned a few things about what's needed in a perfect mortgage loan - low rates & costs, a highly efficient process, and products diverse enough to match the diversity of our clients. The perfect loan.


At Mason-McDuffie Mortgage that's what we strive to provide every day. Whatever type of residential mortgage product you're seeking, we have an option for you. We have the knowledge to help the most experienced real estate investors, and the experience to help first time home buyers easily navigate the path to homeownership. We help home buyers find the best purchase loans, homeowners save money and reach their financial goals through refinance programs, and serve the needs of real estate agents, financial advisors, CPAs, builders, and attorneys in helping their clients achieve the dream of home ownership, and move forward on the road to wealth and financial success.

Our goal is to help customers find the right loan product at the best price. We're known for great rates and low prices, but when the loan process is complete, many clients say their favorite part of working with John Meussner & the Mason-McDuffie team is the level of service provided along the way.

Mason-McDuffie is licensed to lend in many states across the country. John is personally licensed in CA, CO, DE, FL, GA, MD, MT, NC, NJ, NV, PA, OK, OR, SC, TN, TX, VA, and WV (with more states on the way). Need a mortgage somewhere we're unlicensed? We have a great network of trusted professionals around the country, so if you need a great referral, ask here.

We hope you find all of the information that you need, but if you have any additional questions or would like to begin the mortgage process please give John a call at (949) 247-7530.


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Why choose Mason-McDuffie Mortgage?

Our Experience

John Meussner has over 20 years of experience in residential lending. That means we can find a solution to any situation.

We're Local

John Meussner is proud to serve the San Ramon area. Whether you're looking to move here or move up, we're here to help.

Our Values

Every member of the Mason-McDuffie Mortgage team prides themselves on their honesty, integrity, and lasting relationships with clients.

Award Winning Mortgage Technology



With our digital mortgage experience you can apply for a home loan on the go. A few advantages of Mason-McDuffie's mobile application system are ease of use, secure digital document upload, and answers to your questions at your fingertips. The home loan process has never been easier to manage on the go.

John Meussner | MLO NMLS 138061

Licensed by The Department of Financial Protection and Innovation under the California Residential Mortgage Lending Act. NMLS# 1141
MasonMac Corporate

Mason-McDuffie Mortgage

Office: (949) 247-7530

12647 Alcosta Blvd
Suite 300
San Ramon, CA 94583


Not  a  commitment  to  lend. Rates  and  terms  subject  to  change  without  notice. Licensed by The Department of Financial Protection and Innovation  under  the  California  Residential  Mortgage Act  No. 4130968; AL  #22653; AR  #32700; Colorado regulated by the Division of Real Estate; DE #019623; FL #MLD819; Georgia Residential Mortgage Licensee #20924; ID #MBL-5861; Kansas Licensed Mortgage Company #MC.0025601; KY: #MC701698; MD: #16927; Mississippi Licensed Mortgage Company Licensed by the Mississippi Department of Banking and Consumer Finance; Licensed by the NJ Department of Banking and Insurance; NC: L-152867; NV: #3681; OK: #ML012358; Licensed by the Oregon Division of Financial Regulation #ML-3808; PA: #37008; TN: #112513; Licensed by the Virginia State Corporation Commission #MC-5579, WV: #ML-31523/MB31759. NMLS #1141. www.nmlsconsumeraccess.org