In what would continue a building boom around UW-Madison, a developer is proposing to demolish two houses for a $6 million, eight-story apartment building in the Langdon Street National Register District. Developer Patrick Corcoran is seeking to demolish two two-story, wood-frame houses at 617 and 619 Mendota Court for a 40,000-square-foot building that would have 33 rental units and a total of 103 bedrooms.