Exhibit 10.18 FOURTH AMENDMENT TO LEASE ------------------------- THIS FOURTH AMENDMENT TO LEASE (this "Amendment") is made and entered into as of this 4th day of April, 1998 by and between TEACHERS INSURANCE AND ANNUITY ASSOCIATION OF AMERICA, a New...Lease • June 12th, 1998 • Focal Communications Corp • Radiotelephone communications • Illinois
Exhibit 10.17 License Agreement # LA97-10 --------------------------- Licensee: FOCAL Communications Corporation ------------------------------------------ 200 N. LaSalle Street ------------------------------------------ Chicago, Illinois 60601...License Agreement • June 12th, 1998 • Focal Communications Corp • Radiotelephone communications • Texas
SUBLEASEFocal Communications Corp • June 12th, 1998 • Radiotelephone communications • California
Exhibit 10.5 NETWORK PRODUCTS PURCHASE AGREEMENT Northern Telecom Inc., a Delaware corporation having offices at 2350 Lakeside Bvld., Richardson, TX, 75082 ("Nortel") and Focal Communications Corporation, a Delaware corporation, having its principal...Network Products Purchase Agreement • June 12th, 1998 • Focal Communications Corp • Radiotelephone communications • North Carolina
BETWEENFocal Communications Corp • June 12th, 1998 • Radiotelephone communications
DateFocal Communications Corp • June 12th, 1998 • Radiotelephone communications • New York
