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Hi, sorry in advance if I'm telling you something you already know.

First, check which version of LEED your project is (v4, v4.1, or v5). Under the Minimum Energy Performance credit in the LEED Reference Guide, it will reference a certain year of the ASHRAE 90.1 energy standard. In Appendix G of ASHRAE 90.1, there are a few tables (they're labeled differently in the different years of the standard) that details how to choose the baseline system based on building type/use, square footage, climate zone, etc.

Please respond if you have more detailed questions. Also, if you don't have access to the LEED Reference Guide or the ASHRAE 90.1 standard, you can let me know which version of LEED your project is using and I can screenshot the tables.

Hope that helps.