Plato, Laws 779b

ἀνθρώποις εἶναι, τὰς οἰκοδομίας χρὴ τὰς τῶν ἰδίων οἰκήσεων οὕτως ἐξ ἀρχῆς βάλλεσθαι, ὅπως ἂν ᾖ πᾶσα ἡ πόλις ἓν τεῖχος, ὁμαλότητί τε καὶ ὁμοιότησιν εἰς τὰς ὁδοὺς πασῶν τῶν οἰκήσεων ἐχουσῶν εὐέρκειαν, ἰδεῖν τε οὐκ ἀηδὲς μιᾶς οἰκίας σχῆμα ἐχούσης αὐτῆς, εἴς τε τὴν τῆς φυλακῆς ῥᾳστώνην ὅλῳ καὶ παντὶ πρὸς σωτηρίαν γίγνοιτʼ ἂν διάφορος. τούτων δέ, ὡς ἂν μένῃ τὰ κατʼ ἀρχὰς οἰκοδομηθέντα, μέλειν μὲν μάλιστα τοῖς ἐνοικοῦσι πρέπον ἂν εἴη,

then the building of the private houses must be arranged from the start in such a way that the whole city may form a single wall; all the houses must have good walls, built regularly and in a similar style, facing the roads, so that the whole city will have the form of a single house, which will render its appearance not unpleasing, besides being far and away the best plan for ensuring safety and ease for defence. To see that the original buildings remain will fittingly be the special charge of the inmates;