[ssebro]

Check out how Lockitron is marketing their product - yours can deliver similar value, except to residents of apartment complexes. https://lockitron.com/preorder

I would first figure out the size of the market, then pick a price point (informed by the size of the market + the pain solved by your solution), then a marketing strategy (target either building management or individuals).

While most people on HN are telling you to market to the apartment complexes, I think you might want to market towards individuals, since they are the ones who feel the pain that you alleviate. You can target apartment complexes if you alleviate some pain that they have (maybe having your system is something they can include in marketing materials, which will get them more occupants/better occupancy).

The best thing about targeting individuals is that you may be able to get them to market for you (see dropbox), and that they will cross pollinate your solution to new apartment complexes when they move.