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About Diane

Meticulous and practical commercial real estate development and borrower financing counsel

Diane Haller is a real estate lawyer whose clients include pension funds, public and private companies, national and local developers, and investors. She focuses on highly complex commercial transactions such as:

  • Real estate development, including incentive agreements
  • Real estate financing, representing borrowers
  • Real estate portfolio transactions

Clients appreciate that, with more than 30 years of legal experience, Diane brings both deep legal knowledge of real estate and extensive historical knowledge of the who, what, why and how of real estate deals, enabling her to offer valuable context to the legal advice she provides.

Experience in Action

  • Advising on all aspects of real estate and land development.
  • Advising borrowers on real estate financing.
  • Advising on the acquisition, disposition, sale and leasing of office and other commercial properties, master planned communities, mixed-use developments and redevelopment projects.
  • Negotiating development agreements, incentive agreements and grant agreements with municipalities and other government agencies on behalf of developers, institutional organizations and corporate users.


  • Ongoing representation of a significant pension fund in connection with acquisition, management, disposition and financing as borrower of large commercial properties. Recent matters included complex loans and sales for an aggregate of 1.5 million square feet of office and retail space and related parking facilities.
  • Representing Catellus Development Corporation in connection with the master planning of 330 acres of prime urban land into a future-forward redevelopment located in Tempe, Ariz., and associated redevelopment and disposition of land by long-term ground leases through a public private partnership.
  • Represented Phillips 66 Company, a diversified energy manufacturing and logistics company, in connection with portfolio transactions for acquisition, disposition and associated structured financing relating to retail gasoline stations and associated fuel supply agreements.
  • Representing JEN Partners, a private equity firm, in the acquisition, disposition, development and land-banking of residential master planned communities, and the financing of JEN Partners' land-banking and build-for-rent operations.
  • Represented the developer in the redevelopment of Park Central Mall in connection with development agreements with the City of Phoenix, including a development agreement providing for the formation of a community facilities district to finance the construction and ownership of a parking garage.

Professional Recognitions

  • AZ Business Magazine "Top 100 Lawyers in Arizona" (2016, 2017, 2021)
  • Phoenix Business Journal "Outstanding Women in Business" (2015)
  • Best Lawyers in America® "Lawyer of the Year"(2015, 2018, 2022: Real Estate Law:)
  • AZ Business Magazine "Arizona’s Top Lawyers" (2014: Real Estate)
  • AZ Business Magazine "50 Most Influential Women in Arizona Business" (2014)
  • Southwest Super Lawyers® (2007-present: Real Estate)
    • Top 25: Women Southwest Super Lawyers (2020, 2021, 2023, 2024)
    • Top 50: Southwest Super Lawyers (2020, 2021)
  • Best Lawyers in America® (2005-present: Real Estate Law)
  • Chambers USA® (2004-present: Real Estate), (2023-present: Real Estate: Finance)
  • Spirit of Philanthropy Award from the Association of Fundraising Professionals, for work on behalf of Habitat for Humanity (2002)
  • Martindale-Hubbell® AV Peer Review Rated

Professional & Civic Activities

  • Roosevelt Row Community Development Corporation, board of directors (2023)

  • American College of Real Estate Lawyers, member
  • Phoenix Community Alliance, chair of the board of directors and Executive Committee
  • Downtown Phoenix Inc., member of board of directors and Executive Committee
  • Valley Partnership, former member of board of directors
  • Habitat for Humanity, Central Arizona, former member of board of directors, Executive Committee and advisory council
  • Arthritis Foundation, Greater Southwest Chapter, former member of board of directors
  • Arizona Leadership 2000, member (class of 1996)

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