The only changes necessary from my viewpoint are

1. "... guesthouse was built ..." --> "... guesthouse had been built ..."

2. Separate these two paragraphs by more than one line, maybe even putting some kind of separation mark in thus: - o 0 O 0 0 - (This suggestion can safely be ignored - it is similar to writing para 1 as a prologue.)

The change from perfect tense to imperfect is abrupt and effective: why go back? Continue using the imperfect tense so you have the perfect to fall back on if you need to refer to ideas that happened before the action taking place. Otherwise you'll need to use a much more surprising tense (pluperfect, I think) and you run the risk of confusing your "have had's" with your "had's" and "had had's"