The District will begin using eminent domain to acquire parcels of land at the site of the Washington Nationals' ballpark by the end of this month, after unsuccessful negotiations with nearly half of the landowners. City officials said they expect to file court documents to take over at least some of the 21-acre site in the coming weeks and have $97 million set aside to buy the properties and help landowners relocate. The city made offers to all 23 landowners on the site last month but received no response from 10. "We think there are some that we'll have good-faith...