You could try this company www.lavidamortgages.com speak with a chap called Henry Slade, i do know a number of La Tercia owners have used his services.
Regarding electrical work there is a owner on site who fits lighting etc, he also operates a keyholding management service if you would like further details drop me a pm.
The commercial centre units are not occupied has yet.
If you would like any asssistance with any other questions you have, will try to help best i can.
We think the place is great and can only get better, has the site matures.