Sentence:  We had accomplished about three-quarters of[ the distance, and were beginning to look to the terminataon of our labors; Cape Traverse was full in sight, and even the <WSD>porthouse</WSD>, which was our goal, and we knew that we could now be seen by the lookout, who watched the course of the boat as soon as it came in sight, in order to send the sleigh along the coast to meet the party. 
Meaning of the word marked with <WSD> tags:  A building that contains the offices of officials responsible for running a port, space for customs, etc.