What was permitted
Residents near 600 E Grand Ave in the Near North Side can observe the scope of temporary construction projects. This permit details the construction of a 72' x 36' steel-framed, open-air structure intended to enclose a butterfly house for a limited duration.
This temporary structure permit is active and was issued on May 4, 2026, with a substantial estimated project cost of $2,000,000. The project is managed by FOUNDATION MECHANICS LLC.
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View the official permit record
Tracking number, work description, cost and dates
View the official permit record
Tracking number, work description, cost and dates
| Tracking number | 101081679 |
|---|---|
| Work permit # | — |
| Job filing number | — |
| Work type | — |
| Status | ACTIVE |
| Job description | SPR - 2019 CBC - TEMPORARY STRUCTURE FROM MAY 1ST 2026 - OCT 27TH 2026 (180 DAYS).CONSTRUCT AT 72' X 36' STEEL FRAMED, OPEN AIR STRUCTURE TO ENCLOSE A BUTTERFLY HOUSE. A LETTER FROM STRUCTURE PEER REVIEWER HAS BEEN PROVIDED. SAME PROJECT AND DRAWINGS WERE PERMITTED IN MAY 3RD 2024, WITH PERMIT #101047769 AND REINSTATED APRIL 15TH, 2025 PERMIT #101067293. |
| Floor / unit | — |
| Estimated cost | $2,000,000 |
| Approved | April 3, 2026 |
| Issued | May 4, 2026 |
| Expires | — |
| BBL | — |
| BIN | — |
Property owner
Navy Pier INC
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