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Tammera R. Diehm

p (612) 604-6658   f (612) 604-6958 
William Mitchell College of Law, J.D., summa cum laude, 2003
Augsburg College, B.A, Political Science & Urban Studies, summa cum laude, 1993
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Tammera R. Diehm is a shareholder at Winthrop & Weinstine with extensive expertise in complex real estate and leasing matters. In her practice, Tami has represented local and national clients of all types and sizes in real estate transactions involving multiple levels of government approvals, environmental challenges and various forms of public and private financing. Tami regularly appears before local governments and regulatory agencies on behalf of clients seeking land use and permitting approvals, and works with clients to find creative solutions to complex projects.  Tami served as city attorney for a first ring suburb for eight years, and is currently serving her third term as an elected city council member for Columbia Heights, where she lives.  Her knowledge of both the legal and political aspects of land use and zoning issues bring a fresh perspective to real estate development projects.  

In addition to land use, environmental and real estate development, Tami has experience representing both for-profit and tax-exempt organizations on a variety of issues, including formation, tax and general governance. She has assisted organizations with compliance matters involving the Internal Revenue Service, the Minnesota Attorney General’s office, the Minnesota Campaign Finance and Public Disclosure Board and the Federal Election Commission. Tami provides general counsel services to a number of for-profit and non-profit clients of varying sizes throughout the Twin Cities area, and is a frequent speaker on issues related to lobbying and corporate political involvement.    

Prior to joining the firm, Tami served as a judicial extern for Federal Magistrate Judge Jonathan Lebedoff (2003) and clerked for the Honorable Russell A. Anderson, Minnesota Supreme Court, 2003-2004. In addition to serving on the City Council, Tami is a member of the Columbia Heights Economic Development Authority and the Chair of the Housing and Redevelopment Authority. Tami is an appointed member of the Metropolitan Council’s Land Use Advisory Committee and served as a policy member of the Minneapolis Nicollet-Central Policy Advisory Committee. Tami has been recognized by her peers with honors including as a Rising Star, 2007-2012; inclusion in The Best Lawyers in America© in Municipal Law and Land Use Zoning, 2010-2015; a Forty Under Forty honoree; the MSBA North Star Lawyer recognition, 2012-2013; and among the "Top Women in Finance" by Finance & Commerce, 2014.

Bar Admissions

Minnesota, 2003
U.S. District Court for the District of Minnesota, 2010


Articles & Presentations

Campaign Finance
Speaker. "Getting Engaged Without Breaking the Law." Minnesota Business Partnership. 20 Aug. 2014.

Qtd. Gallegos, Anna. "McCutcheon V FEC: Narrow Ruling Prompts Larger Campaign Donation Debate." LXBN. 7 April 2014.

Presenter. "Corporations Have First Amendment Rights Too: An Introduction to How Corporations can be Active in American Politics." 15 Jun. 2012.

Speaker. "There's an Election Coming! What Corporate Counsel Need to Know About Political Law." Hennepin County Bar Association. Live Webcast. 19 Jan. 2012.

Panelist. "Lobbying by Non-Profit Clients: Navigating Federal and State Regulations." Strafford Publications. Webinar. 19 Oct. 2011.

Co-author. "Minnesota Responds to Citizens United." Newsletter of the ABA Business Law Section Committee on Government Affairs Practice. Vol. 1, Issue 3. (Summer 2010). Republished: ABA Business Law Section's Business Law Today. 28 Oct. 2010.

Co-author. "The Hatch Act: It's Not Just for Federal Employees Anymore." Newsletter of the ABA Business Law Section Committee on Government Affairs Practice 1 (Fall 2009). Republished: Newsletter of the ABA Business Law Section. Mar. 2010.

Speaker. "The Basics – Laws Governing Candidates and Campaign Finance." How to Run for Office. Minnesota Association of Realtors’ Conference Room, Minneapolis. 20 Aug. 2009.

Real Estate
Qtd. in Heilman, Dan. "Read the Fine Print: How to Avoid Legal Hassles Between Office Tenants, Landlords. Finance and Commerce. 9 Aug. 2012.

Speaker. "Unlawful Detainers and Collection Issues: Practical Suggestions for Dealing with Tenant Problems." Minnesota Continuing Real Estate Education. Jun. 2012.

Co-Author. "Negotiating Commercial Leases for Small Business." Minnesota CLE Deskbook for Representing the Ongoing Business. Oct. 2011.

Co-Presenter. "Business Leases and the Attorney's Lease Analysis Letter." Minnesota CLE. 29 Oct. 2011.

Speaker. “Developing the Next Killer App: Who Will Test the Prototype – Development Finance.” Public Finance Seminar, Ehlers. Northland Inn, Brooklyn Park, MN. 4 Feb. 2011.

Presenter. "Getting Your Real Estate Development Through City Hall: Practical and Ethical Considerations of the Development Approval Process.” Hennepin County Bar Association CLE, Minneapolis, MN. Jan. 2008. 

Presenter. “The Legal Environment of Investment Real Estate.” University of St. Thomas Mini Masters Series. University of St. Thomas, Minneapolis, MN. Nov. 2007.

Presenter. "Dealing With Decision Makers: Practical and Ethical Considerations of the Development Approval Process." The Development Approval Process in Minnesota. Lorman CLE, Bloomington and St. Paul, MN. Apr. 2007.

Presenter. “Brownfield Redevelopment: Columbia Heights Industrial Park.” 2006 Ehlers Public Finance Seminar. Brooklyn Center, MN. Feb. 2006.

Author. "When Representing Clients Before City Hall, Some Attorneys are Required to Register as Lobbyists.” Minnesota Lawyer. 14 Aug. 2006: 21.

Qtd. in Swedberg, Jamie. "Pro Business: Pro bono work by local law firms helps both small business and nonprofit organizations." Twin Cities Business. Feb. 2008: 99-104.

"Spotlight on Tammera (Ericson) Diehm." Inside Augsburg. 18 May 2007.

Author. “Appellate Tips From a Law Clerk's Perspective.” Ramsey County Barrister. Feb. 2005.


Press Releases

Client Alerts

Honors & Awards
  • "Top Women in Finance," Finance & Commerce, 2014
  • MSBA North Star Lawyer for Pro Bono Service, 2012-2013
  • The Best Lawyers in America©, 2010-2015 (Land Use Zoning and Municipal Law)
  • "40 Under Forty" Honoree, Minneapolis/St. Paul Business Journal, 2010
  • Minnesota Rising Stars, Super Lawyers®, 2007-2012
  • “Up & Coming Attorney,” Minnesota Lawyer, 2006
  • Augsburg College First Decade Award, October 2003
  • William Mitchell Student of Merit Award, June 2003
  • Assistant Editor, William Mitchell Law Review, 2002-2003
  • Burton Brief Award, 2001

Professional Associations & Memberships
  • American Bar Association
  • Minnesota State Bar Association
  • Anoka County Bar Association

Elected Offices & Appointments

  • City Council Member, Columbia Heights, 2003-Present
    • President, 2007-present
  • Commissioner, Economic Development Authority, Columbia Heights, 2003-present
  • Commissioner, Housing and Redevelopment Authority, Columbia Heights, 2003-present
    • Chair, 2006-present
  • Board of Directors, LegalCORPS, 2011-present
  • President, LegalCORPS, 2013-present
  • Member, Metropolitan Council Land Use Advisory Committee, 2007-present
  • Commissioner, Planning and Zoning Commission, Columbia Heights, 2000-2002
  • Commissioner, Charter Commission, Columbia Heights, 1998-2002
    • President, 2000-2002
  • Member, Nicollet-Central Policy Advisory Committee, 2012-2013
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