New York City-based TH Real Estate, a division of TIAA Global Asset Management is planning on acquiring the 85,011 square foot 400 Montgomery office building in San Francisco for approximately $50 million, according to sources familiar with the transaction. The property is under contract to the buyer with a closing projected to happen very soon. TH declined to comment when contacted for this story. The real estate investor will make the investment on behalf of its general account. There is a local firm that will be involved in the asset going forward. This is Emeryville-based Harvest Properties.