My building plan for a commercial building (ground plus three floors) in LPA is almost complete (70% done). However, I want to change it to a ground plus two floor structure, which is still within the allowed limits. Is it possible to make this modification? How can I change the plan and continue the process?

Yes, you can modify your building plan within the allowed limits. You need to submit a revised plan to the Local Planning Authority (LPA) with a detailed explanation of the changes and necessary documentation, including revised drawings and structural calculations if applicable. The LPA will then review and approve or reject the modification.