An apartment complex currently houses 280 people who are spread out across buildings standing on 200,000 square feet of land

Question

An apartment complex currently houses 280 people who are spread out across buildings standing on 200,000 square feet of land. The owner of the complex is planning to expand by purchasing an additional square plot of land measuring 200 ft by 200 ft and constructing one more apartment building on this plot. 
Assuming that the new building will house as many people as each of the other 4 buildings, which statement provides the best estimate of the effect this expansion will have in terms of the square feet of land per person living in the complex?  
the square footage of land per person will decrease by about 140 ft² 
the square footage of land per person will decrease by about 30 ft² 
the square footage of land per person will not change 
the square footage of land per person will increase by about 140 ft²

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