In addition to buying and building homes for his children's families, J. P. Morgan wished to build a structure for his book collection, which by 1900 took up more space than could fit in his residence. On 36th Street, between his residence and the Satterlee house, Morgan initially hired Warren and Wetmore to design a Baroque-style library. After rejecting Warren and Wetmore's plans, Morgan hired Charles McKim of the firm McKim, Mead & White to design the library in 1902. C. T. Wills was hired as the builder. By 1904, the library was being dubbed "Mr. Morgan's jewel case". While the library was under construction, Morgan acquired two hundred cases of books, which were temporarily stored in the Lenox Library and moved to Morgan's personal library starting in December 1905. Around the same time, Morgan hired Belle da Costa Greene as his personal librarian.