When are sealed drawings required for existing commercial buildings?

In buildings exceeding 2,500 square feet and $90,000 in value, sealed drawings are required if structural work is done, if load is added to the building structure, or if changes to egress are made.

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1. Can I request a framing inspection before obtaining trade rough-in inspections?
2. Can a tenant in a commercial building remodel a space without a general contractor’s license or sealed drawings?
3. When are sealed drawings required for existing commercial buildings?
4. When is a permit required for improvements to a single family dwelling?
5. When is a permit required for improvements to a commercial building?