I recommend against Arlo wireless systems.

I think a wireless alarm system is worth the investment.  

Hi everyone, what type of wireless cameras do you recommend for the exterior shared areas of your multifamily buildings? 

Buy 4 wireless remote sensors.

I'm putting in a 20-30 door complex and would like to reduce key management overhead with technology.Are there any smart lock systems that would give wireless entry to common areas and specific units based on fob/card/phone proximity scan and/or location detection? 

I got quotes of $35,000, $40,000 and $35000.Cut out and remove the existing cast iron hot water boiler, both hot water heaters.Cut out and remove the existing 11/2"-21/2" supply and return heating mains that run from the mechanical room (back of the house) to the meter room (front of the house).Install 2- 9 port manifold stations in the mechanical for supplying heat to the cast iron radiators.Plumb the supply and return (home runs) 1/2" pex tubing for the cast iron radiators from the manifolds to the existing branch of risers in the basement ceiling.Pressure test all piping.Pipe new 11/4"x 50' gas piping from the meter room to the mechanical room.Pressure test gas piping.Install a HTP UFT 140 high efficient modulating condensing hot water boiler and a Turbomax 45 Reverse Indirect Tank (Buffer tank and Potable hot water) with near boiler piping and controls containing:The supply and return header piping from the UFT 140 boiler to the Turbomax 45 will be piped in a 2 pipe buffer tank configuration.Isolation drain and purge valves.Air and dirt magnet separators.High efficient ECM circulating pumps with isolation pump flanges.Hydronic expansion tank with support bracket.Back flow preventer and auto filer combo unit.Inline sediment and De-minerlized filter.Controls & Wiring:Low Water Cut Off.18- Manifold Actuators.Zone Control Box's.3-Thermostats with wireless sensors.Outdoor Sensor.Cold and Hot water potable water side:Isolation valves.Thermostatic mixing valve.Thermal expansion tank with support bracketPipe 3" Polypropylene and PVC flue and air intake piping from the boiler to the outside along with a thin low profile termination kit.Install a Condensate neutralizer pump and plumb the discharge tubing from the pump to the indirect stand pipe in the mechanical room.Pressure test all piping.Install and wire in all controls in the mechanical room.Power flush the system and remove any debris that is in the radiators and piping.Drain the water out of the entire system.Re-fill the entire heating system with De-mineralized water and power purge all the air out of the entire system.Set and adjust the flow meters on the manifolds as per radiators btu's output.Perform a combustion analysis on the boiler and make any adjustments if needed.

We called a few people who are licensed, but the bids were ridiculous ($1500 to run data, phone and alarm lines), so we decided that we'll just install a wireless alarm system (which are very common these days), not install phone lines (nobody should care) and to do data/cable installation as an upgrade for buyers who want it.Here are some pics of the framing:

Simplisafe security system - a decent wireless system runs I think $300-500, plus $15-25/mo for monitoring.

If and when someone wants cable ran after the fact they can either have it ran/fished through the walls or what most will do, even though I personally don't prefer this option as it looks sloppy and connections won't be as reliable, is have one of the cable companies come out and run coax to the various rooms along baseboards and through closets.As for WiFi... it's a wireless solution so no wires are needed here.

I do recommend Z Wave locks instead of wireless due to the battery usage.