Respectfully, I disagree. I have a handful of friends/colleagues who had apartment complexes built nearby their suburban McMansions, and each one had the same story: increased traffic and vehicle congestion, decreased available street parking, increased noise pollution, increased pedestrian traffic, and yes, increased crime. All of these things will make property values go one direction, and it ain't higher.
Extreme example: Back in the 90s, a friend bought a brand new, suburban home. Two years later, an apartment complex was built on a vacant lot about two blocks away. Two years after that, the apartment complex started accepting Section 8's. The crime started almost immediately. His car was broken into. His house was broken into. Loud music all night. Beer bottles on his lawn in the morning. His once quiet suburban home was no more. He eventually sold and took a significant loss. I know I'm the bad guy for pointing this out, but facts are facts, and money is real. Increasing density where it was never intended will negatively impact your property value.
(^^^ I was told there were lawsuits, but California officials got involved and squashed it, saying basically, "We said they could accept Section 8's, and there ain't shit you can do about it. Suck it.")