EXHIBIT 23.1 CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS As independent public accountants, we hereby consent to the incorporation of our reports, included in this Form 10-K, into Simon Property Group, L.P.'s (formerly Simon DeBartolo Group, L.P.) previously filed Registration Statement File No. 333-33545-01. ARTHUR ANDERSEN LLP Indianapolis, Indiana, March 26, 1999 91