Answer: Temple University. 

Late in October 1964, President Lyndon Johnson was on the campaign trail. Philadelphia was one of several stops that he made along the East coast. On October 30th, he stopped at Temple University with Albert M. Greenfield to address a large group of students. The day prior Johnson made a speech at Convention Hall, which was once located at 3400 Civic Center Boulevard.

He made a set of impassioned remarks in the city that he ended as follows:
When William Penn founded this city almost 300 years ago, he wrote out a prayer for Philadelphia. And in that prayer, as most of you, I know, remember, there are these words:

"What love, what care, what service, what travail has there been to bring thee forth and preserve thee from such as would abuse and defile thee .... My soul prays to God for thee that thou may stand in the day of trial, that thy children may be blessed of the Lord, and thy people may be saved by His power."

Those words express the prayer in my heart tonight for the people of Philadelphia and for the people of America. So many have given so much to win for us what we have tonight--together. We must not and we shall not lose all of this in one moment of passion or frustration or recklessness with the peace, or a moment of irresponsibility with our unity.

Several HSP collections contain photographs from visits of U.S. Presidents to Philadelphia, including the Philadelphia Record morgue collection (#V07), the Albert M. Greenfield papers (#1959), the Joseph Sill Clark papers (#1958), the Richardson Dilworth papers (#3112), and the Natalie Saxe Randall papers (#3466).

Lyndon B. Johnson: "Remarks in Convention Hall, Philadelphia.," October 29, 1964. Online by Gerhard Peters and John T. Woolley, The American Presidency Project. (http://www.presidency.ucsb.edu/ws/?pid=26690)