The Boulder Group reports 338 net-lease properties worth about $832 million are on the market, double the amount the company was tracking in March. That represents 4.75% of the total net-lease properties available in the US and 3.9% of their total value, according to the firm, which notes the Chicago population makes up less than 3% of the national headcount.

"Due to the perception of a rising interest rate environment, many investors have flooded the market with properties which those investors may not have chosen to dispose of but for the rising interest rate threat," according to the Boulder Group's Chicago Net-Lease Market Report, authored by research director Jeff Rothbart.

Retail properties make up the bulk of the local net-lease total, with 290 assets worth $716 million available. However, the sharpest increase has been seen in the office sector, where increases of more than 400% have been seen since March. Nonetheless, the 34 properties worth $79 million represent about 10% of the total net-lease market, a smaller share than what is seen nationally, according to Rothbart's report.

While the number of properties on the market has jumped dramatically, capitalization rates have remained stable at 8% overall, according to the Boulder Group. Only 15% of the properties offered for sale have cap rates above 9%, the firm reports.