By 1900, the plots north and east of J. P. Morgan's house became available for sale after the death of Melissa Stokes Dodge, who lived in the Dodge mansion just north of Morgan's house. Morgan bought a plot east of his residence in 1900, and two years later, acquired two adjacent lots with a total frontage of . On the far eastern side of that plot, McKim, Mead & White designed a six-story house at 33 East 36th Street for Morgan's daughter Louisa and her husband Herbert Satterlee. Morgan acquired William E. Dodge's home in April 1903. While the Satterlee house was under construction, the couple moved into the Dodge mansion; afterward, it was razed and replaced with a garden designed by Beatrix Farrand. By December 1904, Morgan had also purchased the old Isaac Newton Stokes house at 229 Madison Avenue for his son J. P. Morgan Jr., who was known as "Jack". When Jack Morgan and his wife Jane finally moved into 229 Madison Avenue in 1905, he commissioned a major renovation of the interior and renumbered it as 231 Madison Avenue. Jack Morgan also performed $1,900 in changes to the house's exterior. J. P. Morgan's holdings on the city block, by 1907, included the whole frontage on Madison Avenue, stretching on 36th Street and on 37th Street.