Offer your services as a financial analyst on a consulting basis. 

You'll want to make sure your growth assumptions, rent roll assumptions, and expense assumptions are independent of the broker's opinion.

Make sure he doesn't have a written agreement to provide service.

The key in my opnion is a great dependable support staff, namely your cleaning service.

The USGS has monitoring points for those concerned about river and stream levels, and the National Weather Service also provides graphs using data from the USGS.

There may be sites or services that will give you a vacancy number.

Also, other properties that I love in booming cities are maxi-storage or light industrial buildings that contractors or service providers can call home for their businesses. 

If your broker only represents one carrier (captive agent) or only has a couple of markets you should also consider getting quotes from other Independent agents who represent different markets.The following is part of a post I made to a new owner in the past. 

I'm having trouble putting faith in a tech company to provide tech services that I can't even get setup.I give a lot of leeway to the program simply from the BP referral to the site... but has anybody used this yet?

is there a paid service i can use to get this data from