I'm confused. Please help. Should US Airways sell the land with a value of $2.5 million? Which is a better choice?

US Airways owns a piece of land near the Pittsburgh International Airport. The land originally cost US Airways $375,000. The airline is considering building a new training center on this land. US Airways determined that the proposal to build the new facility is acceptable if the original cost of the land is used in the analysis, but the proposal does not meet the airline's project acceptance criteria if the land cost is above $850,000. A developer recently offered US Airways $2.5 million for the land. Should US Airways build the training facility at this location?