Rental income data

[Frank A.]

I am looking for reliable ways to get a baseline of rental income for given units in my market. I am wondering if others use web resources to find this data? Or do others always look to real estate agents for this data. I was just thinking it would be nice if there was a web resource avalable that could provide reliable rental rages for apartments given factors like location, sq footage, bedrooms, bathrooms, off street parking or garage space, etc.