Colour of restored building: timeless (4-3)
I believe the answer is:
rose-red
'colour' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
(Other definitions for rose-red that I've seen before include "Colour (of Burgon's city)" , "Coloured like a flower" , "A -- city, half as old as time" .)