Longevity of the product should also be a factor.I'm an interior designer so many factors play into the overall look and costs.

I like the idea of stable income rental for the students near the university area, however I'm also a bit unsure about the longevity of your properties given that the tenants could be more on the younger side. 

One of the main differences as well is the longevity and how more likely the assistant will stay working for your company as long as you need.

and at the end of the day, we need to be able to use common sense in getting into a door.Yes, you will need a WiFi set up to control the lock at your location and a very cheap subscription if you want to control the locks remotely -  but you don't have to.Beware of shiny, good "Apple" design looking products made of cheap and light plastics, especially when it comes to longevity and the heavy mechanics needed to withstand millions of physical movements and human force. 

It works against your longevity and success in the biz.

That is why you have depreciation and reserves to deal with these repairs when it comes due.Yeah I had the east coast homes in mind when it comes to longevity.  

. - listing independence is vital for your longevity.

If you are looking for longevity in the batteries, setup a ZWave or Zigbee home automation setup.I get a year out of 3AA batteries in my Schlage Smart Connect.

I have always used Epson projectors and have been very happy with their performance, longevity, and they support their warranty.  

If any of you have traded equities/futures/etc with any success you know that THE key to longevity is 'cutting your losses'.