I would not go more high tech then a battery non internet lock because when you get into the smart phone type locks like August and nest in a situation like this the online ability to track entry and exit may introduce questions regarding who can access that information.

You can sell all of them and use a 1031 exchange into a completely passive TIC deal that pays out a check each month/quarter.You can buy and sell without holding, pay your taxes as you go and build up a retirement nest egg.

It's also possible that the attic is improperly vented or a bird (or rat) has built a nest in the pipes coming out the roof from the bathroom or from the attic.

He beats himself up sometimes because most investors who start at his age had a comfy career path and some giant nest egg to get them started.

Nest step parcel 2, drove up to look at it .

My grandmother always said it helped keep sparrows and wrinns  from nesting under the porches.

In 20 years, when those houses are paid off, you'll be making 1k per house per month or 120k per yearand you will NEVER have to dip into your net worth to do it.Better still, your net worth will continue to grow as year 21, the value of the homes will go up another 3% so you're nest egg will be 55k bigger.If you were to have a 401k with 1.6 mil, it is NEVER going to pay you any money unless you start taking distributions.

You want to keep your nest egg up because eventually you will have to retire (but maybe not for 20 years!)

It also has the auger tool which is great for grabbing bird nests on rooftop vents.

As @Joel Owens alluded to you'll need some very high returns so as not to eat into your nest egg.