i also think the building work you refer to must be the new car park and viewing area. which may be finished by july....... i think you will see a lot of changes in lower santiago in the last 2 years, the mar y blanc centre is open next to the barcelo santiago with 3 restaurants/cafe bars all with beautiful views over the bay and of course the new walkway between upper and lower santiago. the area is very busy and buzzy. the hotel has been refurbished too! balcon de los gigantes is also more or less sold and occupied now, shops have opened along the side of the building. there are 2 new supermarkets along the calle aswell! los gigantes is slightly quieter now, but still quaint with the old favourite restaurants keeping busy! bamboo still going strong!
lots of changes, most for the better! enjoy your holiday!