A decade ago, if you were a writer, artist or musician based in Los Angeles County who had finally saved enough of a nest egg to consider buying a home, one appealing area that might have still seemed affordable would have been Altadena.AdvertisementIn 2015 the median price for a detached single-family home in Altadena’s 91001 zip code was about US$500,000.In the increasingly elite Silver Lake, around 13km (eight miles) southwest, similar digs would have cost about US$1.4 million. Continuing on that line, in West Hollywood the number was more like US$1.9 million, and you could forget about Santa Monica and...