How to prepare for appealing property tax in front of BOE

[Ankur M.]

Hello, I am new to this website still. I recently acquired a commercial real estate property and the property taxes the next year went up nearly 60%. Therefore I filed an appeal explaining my situation, however the Board of Tax Assessors did not make any changes after review. Now I have to go in front of Board of Equalization after a few weeks. 

My question is how do i go about solving this issue? I'm not educated on how to go about finding comps of commercial property near the location. Or do i hire a professional appealer with 3.5 weeks to go. Any suggestions?