Like Alan I think the word is 'sash'd' (there are clearly two 'long' s's in the word)'
The OED has an example from Celia Fiennes diary describing a house: ' It is
sashed up to the top with low windows to sit in.'
I think that the suggestion that it is well-fashioned makes more sense than that it is well-provided with windows in view of the fact that the window tax was in force at this time. Large numbers of windows probably wouldn’t have been a great selling point.
The problem with that is that the first letter of the word is 's' not 'f'. The cross bar is only on the left side of the word, not going right across it if it would if it were an 'f'.