Create a website that displays a heatmap of rental prices per square foot in an area.

I want to create a minimum viable product demo for a website, assuming the data looks interesting and the I will invest more into this; this is really should be thought of as a production ready prototype. You will use NodeJS to query a REST web service to gather details about apartments for rent, perform some tokenization on the data so it can be shoved into a database as structured data. This will be something that can be run via cron every 24 hours without hand holding. You will define a REST / JSON web service to query this database for enough data to do a heatmap of an area. You will create a HTML5 web page using leafjs and a heatmap library using this data. I have attached a document that describes what I am looking for in some reasonable level of detail.