We prefer to keep it app based so that we can utilize our smart phones as opposed to going through a costly fixed video intercom monitor in each unit. 

The infrastructure would be brand new and to my liking.

What infrastructure are you using to build your website?

Think about a few things when considering investing in upcoming cities 1) Current or future infrastructure projects 2) population shifts over the past 3-5 years and projected population increase/decreases 3) research the area on municipal websites, blogs etc see what people are saying about the area and what local governments plans are.

Gates already have monitored camera so that can be more refined. 

I tell them to give me a call if for some reason they are not able to sell their house.I take them off my mail campaign list but I monitor the listing every now and then.

And the management is only one piece of the work anyway, there will be more.Anyway as far as "how is this possible" as you say, the only way it is possible is if you have a documented track record of solid results with years of experience and a business infrastructure.

Infrastructure costs, traffic, property tax increases, increased housing, fire, police and maintenance can offset the benefits.

Is it possible to monitor that process?

To give you an example I spend about 2 hours on average a day monitoring my prospects, doing follow ups, managing my files, not to mention throughout the day I am receiving calls from responses to my marketing.