Flanagan State Bank Mortgage Division
Mortgage Lender in Sioux Falls, SD – Keystone Mortgage
Mark Wiesner

Mark Wiesner

Senior Loan Officer

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#NMLS # 7024

421 W 18th Street, Sioux Falls, SD 57105




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Mark is a Senior Loan Officer at Keystone Mortgage in Sioux Falls, with 20 years’ experience in the field. He specializes in VA loans, FHA, Rural Development, Conventional, and a variety of “unique situations.” What Mark finds most rewarding about being a lender is helping young families obtain their first home and assisting customers with planning their home purchase after they have been denied by other lenders.


Mark’s advice for prospective homebuyers is to “Work with a Loan Officer who has experience, local presence, and is easy to communicate with.”


Mark lives in Garretson with his family and enjoys four wheeling, sailing, and camping in his free time. He is also a member of the National Guard Association and American Legion, and volunteers at local organizations such as the Rocky Mountain Elk Foundation, Banquet Food Mission, National Guard Association, American Legion, and church board.