Willis Alexander, executive vice president of the American Bankers Association since 1969, has announced his resignation.

ABA President James G. Cairns made the announcement at the ABA conference in New York last Wednesday, saying Alexander's contribution to banking has been "as much or more than any captain of industry."

Cairns said he will appoint a selection committee to recommend a successor.

Alexander has been chairman of the Trenton Trust Company in his native Missouri since 1974 and has been active at all levels of organized banking over the past 20 years.

The ABA, with headquarters in Washington, has 13,000 member banks representing 95 percent of the banking industry.

The National Association of Industrial Office Parks, an Arlington-based professional organization representing the real estate development industry, has chosen Tom G. Congleton as its 1984-85 president.

Congleton is now chairman of the board of Jones & Company of Overland Park, Kan. He also has worked for the Mortgage Bankers of Kansas City. Recently, he completed Congleton Industrial Park, a 120-acre, 56-building development in suburban Kansas City.

The association also has named Victor G. Trapasso its 1985 treasurer. Trapasso is president and chief executive officer of GT Investments in Alexandria.

The NAIOP represents 3,650 professionals who are involved in the development of industrial office parks around the country.

The chief counsel's office at the Internal Revenue Service released a memo recently saying that it is "appropriate" for nonprofit associations to grant commissions and benefit plans to employes without jeopardizing their tax-exempt status.

One of the most flexible of the benefit plans mentioned in the memo, found under section 401(K) of the Internal Revenue Code, allows association employes to defer up to 15 percent of their pretax income and contibute it to a qualified pension plan.

The Washington chapter of the National Association of Accountants has named Carl F. Tennille president for the 1984-85 year. Tennille is currently director of internal audit for the UMWA Health and Retirement Fund.

The Washington chapter is also the recipient of a national NAA distinguished service award, given in appreciation of the local unit's free counseling program for new and struggling business owners in the area.

The Washington NAA chapter has a membership of more than 450 professionals.

The District of Columbia chapter of the American Production and Inventory Control Society has been awarded the gold medal for outstanding accomplishment in the area of professional education by the national APICS chapter.

The national APICS, located in Falls Church, has more than 200 chapters and a total of 51,000 members.