Big things come in small packages, at least if you're a major developer with dreams for the new Southeast DC Ballpark District. Last week, after a year of negotiations, Monument Realty purchased a tiny, 1,344-sqaure foot lot holding a dilapidated house for the seemingly lofty price of $1.1 million. But its value far exceeds the purchase price for Monument, as this parcel – located at the corner of N and Half Streets, SE and at the north entrance of the new ballpark location – is the last piece the developer needed for its planned 2 million square feet of office, residential and retail space. Having already spent $50 million over the past year buying up this land, not having this final lot would have spelled trouble. Monument Realty plans to start building this project next spring, and have it completed in 2009.