I am a product and business leader in consumer tech, and I am actively working toward my first commercial multifamily acquisition, targeting 20-30 unit value-add buildings in Ohio and the Midwest. I already own a residential multifamily, and I am currently underwriting real deals and building relationships with brokers and other investors. I am sharing what I am learning along the way, mistakes included, in case it helps others in the process too. Why I stopped trusting the "return" a seller shows me - I recently underwrote a deal where the seller's worksheet claimed a solid cash-on-cash return. When I rebuilt the numbers myself using their own actual rent roll and expenses, the debt service was higher than the property's current income. At today's occupancy, the deal was losing money and not making the advertised return. What did I fix: I stopped anchoring my offer to the seller's pro forma and anchored it to current, in-place income instead. Any upside from filling vacancies or raising rents becomes a bonus on top of a deal that already works, not the thing keeping it afloat. Lesson: Always rebuild the NOI yourself from the raw numbers before trusting anyone's summary, including your own broker's. What is one number you always recheck yourself before trusting a seller's pitch?