You will be given a definition of a task first, then some input of the task.
In this task, you will be shown a passage. You need to write a fill-in-the-gap question based on your understanding of the events that might be inferred from the passage. Your question should be answerable based on the passage and only have one correct answer. Show the gap in your question with a _ .

It could easily pass for a Bond villain lair or a secluded retreat for those who like to castaway and immerse themselves in nature. Moonhole, a resort nestled under a rocky arch surrounded by the turquoise Caribbean waters, boasts five quaint houses now available for holidaymakers to rent. True to its nautical theme, the idyllic cluster of properties on the Grenadine island of Bequia was built incorporating whalebone, driftwood and shells into each building's structure for a rustic feel. Travellers can explore the stunning Bequia area by day, either by scuba diving, snorkelling, kayaking, fishing or hiking round the impressive landscape.Moonhole is located on the island of Bequia and consists of five villas offering spectacular sea viewsThe unique cluster of stone houses were built by adventurous couple Tom and Gladdie Johnston in the 1960sNow only five of the original 17 houses are available to stay in and come complete with 12 staff members
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A further 16 more houses were built, including a commissary and office as well as living quarters for the growing _ staff.