This is from your link :
The Gisr el-Mudir (Arabic for ‘enclosure of the boss’), situated just west of Sekhemkhet’s
pyramid complex, was located in the early 20th century, but not investigated until the mid-
1990s (Mathieson and Tavares 1993, 28–31; Mathieson et al. 1997; 1999, 36–47; 2000). It
consists of masonry of roughly hewn limestone blocks in layers, making it potentially the
earliest known stone structure in Egypt. Its builder is unknown, but suggested dates have
shifted from Dynasty 3 (Swelim 1983, 33–35; Porter and Moss 2003, 417) to the Early
Dynastic period (Tavares 1998, 1136), and in particular to Dynasty 2 (Stadelmann 1985, 306).
Others have tentatively ascribed the Gisr el-Mudir to Khasekhemwy (Mathieson et al. 1997,
53; Davies and Friedman 1998, 67).