Henry, Harry, and Hubter formed a partnership on January $1,2020.$ Henry and Hunter each contributed $$200,000$ and Harry transferred a building purchased two years earlier. The building had a tax basis of $$150,000$ and was appraised at $$300,000.$ The building was also encumbered with a $$100,000$ mortgage. What is each partners adjusted tax basis

immediately after partnership formation?

I get stuck on if you add or deduct the mortgage from Harry's building. Could you kindly explain which and why?