Built of coral blocks and rubble stone, this two-story, gable-roofed missionary house was erected for Ephraim and Julia Spaulding. A year after its completion, the Spauldings left Lahaina and Dr. Dwight Baldwin and his family occupied the house for the next thirty-two years. In 1840, the Harvard-trained doctor renovated the house and added the single-story wing which was later used as a dispensary and offce. The second story was added in 1849. The main body of the house features a symmetrical facade simply adorned by a two-story lanai running the length of the building. The stone two-story Master's Reading Room with coral-block quoins sits adjacent to Baldwin House. Constructed in 1834, the first floor was used by the missionaries for storage, while the second was reserved for the use of visiting ship captains, offering an alternative to the amusements of the grog shops.