In 1989, director Ted Pillsbury, Brown's successor, announced plans to add two wings to the north and south ends of the building and chose architect Romaldo Giurgola to design them.
A firestorm of protest erupted.
  Critics pointed out that founding director Brown's "Pre-Architectural Program" had specified that "the form of the building should be so complete in its beauty that additions would spoil that form," and that Kahn had achieved that goal extraordinarily well.

A group of prominent architects signed a letter acknowledging the need for additional space but arguing that the proposed addition would compromise the proportions of the original.
 They noted that when Kahn himself was questioned about the possibility of a future expansion, he said that it should "occur as a new building and be situated away from the present structure across the lawn".
 Esther Kahn, Louis Kahn's widow, published a letter voicing similar sentiments, noting that "there is room on the site for a separate building, which could be connected to the present museum."
The project was cancelled a few months later.
In 1989, director Ted Pillsbury, Brown's successor, announced plans to add two wings to the north and south ends of the building and chose architect Romaldo Giurgola to design them. A firestorm of protest erupted.   Critics pointed out that founding director Brown's "Pre-Architectural Program" had specified that "the form of the building should be so complete in its beauty that additions would spoil that form," and that Kahn had achieved that goal extraordinarily well.
A group of prominent architects signed a letter acknowledging the need for additional space but arguing that the proposed addition would compromise the proportions of the original.  They noted that when Kahn himself was questioned about the possibility of a future expansion, he said that it should "occur as a new building and be situated away from the present structure across the lawn".  Esther Kahn, Louis Kahn's widow, published a letter voicing similar sentiments, noting that "there is room on the site for a separate building, which could be connected to the present museum." The project was cancelled a few months later.
Kimbell Art Museum