The amount of equity I have in the investment property is a big factor in whether or not I am ready to sell so I am trying to get an idea of what the market looks like right now for a small multifamily (4-plex) in downtown phoenix.The property had gut rehab when I purchased 4 years ago and is modern and in great shape, and has been consistently fully rented out.

The modern age! 

You have to make your property stand out by it being modern comfortable fun and great pictures.

My role involves data science, property analysis, and software development.

It's not rocket science and it's easy enough I can do it. 

No one is going to look at the brand they are just going to see they were replaced with modern windows.

Whatever modern vinyl thing you put in will be ready for the landfill in 1/4 that time.

Lending is both a science and a dangerous art where you can lose it all.

I tend to agree with this, modern polyurethane is very durable and forms almost an epoxy-like seal. 

I think units furnished with modern comfort but local personality would do well with film industry people, traveling nurses, families of hospital patients, and possibly medical residents.Also, we're getting an Amazon fulfillment center, so that should be good.