WALTHAM — Waltham’s delayed property tax bills should begin arriving in mailboxes later this week, according to Treasurer Lucille Evarts. And payments will also be due later than usual — Nov. 12 instead of the town’s customary Nov. 1 — thanks to a quick Tuesday morning selectboard decision. Evarts said an assessment mistake in calculating the value of the town’s three large solar arrays meant the town’s non-residential rate and grand list had to be recalculated at the state level, a process that took longer … (read more)