| University of Chicago Hospitals |
4,108 |
| Koenig & Strey GMAC Realtors |
1,946 |
| City Colleges of Chicago |
1,911 |
| Coldwell Banker Residential Brokerage |
1,681 |
| National-Louis University |
1,650 |
| Kenosha Unified School District |
1,470 |
| Joliet Junior College |
1,450 |
| Baird |
1,367 |
| Columbia College Chicago |
1,287 |
| Northfield Twp High School District 225 |
894 |
| Seyfarth Shaw LLP |
861 |
| The School of the Art Institute of Chicago |
855 |
| West Bend School District |
828 |
| Oswego 308 Community Unit School District |
811 |
| Maine Township High School District 207 |
802 |
| Saint Xavier University |
714 |
| glenbard HS |
698 |
| Duneland School Corporation |
676 |
| Niles Township Community High School District 219 |
656 |
| Township High School District 211 |
648 |
| Thornton Township High School District 205 |
608 |
| Argonne National Laboratory (ANL) |
600 |
| Stevenson High School |
597 |
| Waukesha Public Schools |
569 |
| North Park University |
568 |
| Waubonsee Community College |
558 |
| Alverno College |
503 |
| Elmbrook School District |
489 |
| USF Corporation |
456 |
| Alzheimer's Disease and Related Disorders Association, Inc. |
454 |
| Carthage College |
441 |
| School District U-46 |
438 |
| Sycamore Community Unit School District 427 |
434 |
| Fermi National Accelerator Laboratory (FNAL) |
425 |
| Milwaukee Public Schools |
416 |
| Oak Park |
406 |
| LW District 210 |
405 |
| Naperville Community Unit School District 203 |
403 |
| Axiom Associates, Inc. |
402 |
| Oak Creek-Franklin Sch Dist |
397 |
| Milwaukee School of Engineering |
380 |
| Carroll University |
363 |
| @ properties |
360 |
| NAVTEQ Corporation |
359 |
| Lake Forest College |
356 |
| McColly Real Estate - India Castaneda |
355 |
| Kaneland CUSD 302 |
349 |
| Lovells |
348 |
| Packaging Corporation of America |
334 |
| Township High School District 214 |
321 |
| Valley View Community Unit School District 365U |
319 |
| Leo Burnett Worldwide, Inc. |
307 |
| Quad/Graphics, Inc. |
294 |
| Concordia University Chicago |
292 |
| East Aurora School District #131 |
286 |
| Leyden Community High Schl Dst |
282 |
| Classified Ventures |
281 |
| Elkhorn Area Sch Dist |
281 |
| Dwight D Eisenhower High Schl |
280 |
| Community High School District 128 |
279 |
| Indian Prairie School District 204 |
278 |
| UHY Advisors, Inc. |
268 |
| St John's Evangelical Lutheran |
258 |
| Kishwaukee College |
253 |
| Century 21 Pro-Team - Blumhardt |
253 |
| Loyola Academy |
242 |
| Valparaiso University |
241 |
| Benedictine University |
240 |
| Kewaskum Sch Dist |
237 |
| Shambaugh |
235 |
| Daily Herald, Paddock Publications, Inc. |
232 |
| Northwestern Medical Faculty Foundation, Inc. |
232 |
| Wheaton College (Liberal Arts College) |
231 |
| Township High School District 113 |
227 |
| Prudential Stark Realtors |
226 |
| Banco Popular North America |
225 |
| Community High School District 94 |
224 |
| Community Unit School Dist 200 |
222 |
| Mount Prospect School District 57 |
213 |
| Neal, Gerber & Eisenberg LLP |
211 |
| Illinois Housing Development Authority |
209 |
| Cook County, Illinois |
209 |
| Integrys Energy Group, Inc. |
201 |
| Sauk Valley Community College |
200 |
| Berlin Packaging |
199 |
| Brinks Hofer Gilson |
198 |
| Bloom Trail High School |
196 |
| Cooper Power Systems, Inc |
195 |
| Trainor Glass Company |
195 |
| Northwest Community Hospital |
194 |
| White Lodging Services Corp. |
192 |
| Rubloff |
192 |
| Rockford College |
191 |
| Moraine Valley Community College |
190 |
| Prudential Preferred Prop. |
189 |
| SmithAmundsen LLC |
186 |
| Reinhart Boerner van Deuren |
184 |
| Connects Learning Center |
183 |
| First Midwest Bancorp, Inc. |
181 |
| Dream Town Realty |
180 |
| Highland Community College - IL |
179 |
| von Briesen |
178 |
| Lake Geneva Area Schools |
178 |
| Calumet College of St. Joseph |
176 |
| Chicago-Kent College of Law |
175 |
| Godfrey |
175 |
| Wintrust Financial Corporation |
173 |
| Central DuPage Hospital |
173 |
| Glenview Public School District 34 |
172 |
| City of Milwaukee |
171 |
| Argo Community High School District 217 |
171 |
| Hexaware Technologies |
170 |
| Delavan Darien School District |
169 |
| Morton College |
166 |
| University School of Milwaukee |
166 |
| Reed Custer Community Unit School District #255 |
165 |
| Shared Technologies Inc. |
163 |
| Prudential Partners Real Estate |
162 |
| Littelfuse, Inc. |
160 |
| Shorewood Sch Dist |
160 |
| Trinity Christian College |
156 |
| Guaranty Bank |
152 |
| Kankakee Community College |
151 |
| Rockford Register Star |
148 |
| Select Hotels Group |
148 |
| Moody Bible Institute |
147 |
| Blackman Kallick LLP |
147 |
| Cook County Hospital |
146 |
| Wisconsin Lutheran College |
146 |
| Pioneer Press Newspapers |
145 |
| Bucyrus International, Inc. |
145 |
| School City of East Chicago |
141 |
| Homesale Realty |
141 |
| Fenton Community High School |
141 |
| Suburban Chicago Newspapers |
139 |
| The Times of Northwest Indiana Newspaper |
138 |
| Querrey |
136 |
| Segal McCambridge Singer |
136 |
| American Appraisal Associates, Inc. |
135 |
| Vance Publishing Corporation |
133 |
| Pepper Construction Group, LLC |
132 |
| Press Ganey Associates, Inc. |
131 |
| Pretzel |
130 |
| Prudential First Realty - Jayne Bockman |
129 |
| The Options Clearing Corporation |
128 |
| Jockey International, Inc. |
128 |
| Mercy Hospital and Medical Center |
127 |
| KIDS |
126 |
| Lewis University |
124 |
| Calamos Investments |
124 |
| Arrowhead Union School Dist |
122 |
| Federal Home Loan Bank of Chicago |
121 |
| Ft Wayne Newspapers |
121 |
| Du Page County, IL |
120 |
| Banner and Witcoff |
117 |
| Factory Card & Party Outlet Corp. |
117 |
| Peoples Energy Corporation |
117 |
| Morton's Restaurant Group, Inc. |
116 |
| Levy Restaurants, Inc. |
116 |
| Uline Inc. |
116 |
| Community Consolidated School District 21 |
116 |
| The Art Institute of Chicago |
115 |
| The John Marshall Law School |
115 |
| City of Naperville |
114 |
| College of American Pathologists |
114 |
| Outokumpu Copper Inc. |
113 |
| lakes community High School |
113 |
| Merchandise Mart |
112 |
| Shure Incorporated |
112 |
| Midwest Banc Holdings, Inc. |
112 |
| AbelsonTaylor Inc |
111 |
| Infogix, Inc. |
110 |
| Federal Signal Corporation |
110 |
| Edstrom Industries, Inc. |
110 |
| MacNeal Hospital |
108 |
| West Monroe Partners |
108 |
| Archdiocese of Chicago |
108 |
| Kildeer Countryside Community Consolidated School District 96 |
108 |
| Hub Group, Inc. |
107 |
| Convergint Technologies |
106 |
| Bombardier Recreational Products |
106 |
| Badger Meter, Inc. |
106 |
| Lincoln International LLC |
106 |
| Stout Risius Ross |
104 |
| Century 21 Country North Inc. |
104 |
| National University of Health Sciences |
103 |
| Griffin Wheel Co |
103 |
| Marshall, Gerstein |
103 |
| Levenfeld Pearlstein |
102 |
| Marian Catholic High School |
101 |
| Community Healthcare System |
100 |
| U.S. Tsubaki, Inc. |
100 |
| Northwest Newspapers |
99 |
| Park National Bank |
99 |
| American Society for Quality |
99 |
| Leydig Voit |
99 |
| Schenck Business Solutions |
98 |
| American Academy of Orthopaedic Surgeons |
97 |
| Aircell LLC |
96 |
| HK Systems, Inc. |
96 |
