In Zoocassa it shows me an area with an average price. The area highlighted includes a very old neighbourhood with small lots and older style bungalows. The area of interest has 500k and higher to be built homes, how to distinguish?

It is very difficult to narrow down specific prices unless you research the specific address and see what neighbours homes have been selling for. If you are looking to sell your home, there are plenty of Realtors who offer free home evaluations. There is alot to consider when determining the value of a home, neighbouring homes is one comparison used, but most of the value comes from the size of the home, types of finishes inside etc etc...If you are looking to buy a home, a professional Real Estate Agent does the comparable value footwork for you.

The ZooPraisal is meant to give you an idea of what your home is worth. If you need something more specific, ZooCasa recommends you contact a realtor.

Contact a Realtor. Most Realtors will give you a complimentary no obligation evaluation of what your property would be worth under current market conditions

The best is to contact a local Realtor, I provide free service for this type of evaluation.