Having an extra house, condo or apartment is potentially quite lucrative, especially if  what the tenant pays covers your mortgage, taxes, insurance, etc. Someone else is basically building your pool of wealth because in 10 or 20 years, you’ll have this $100,000+ asset that is paid off. You can sell it for a large chunk of cash, or keep renting it out and have a nice, steady stream of income. The major problem is that managing this isn’t exactly passive, unless you hire a rental management company who generally take one month’s rent out of the year in exchange for doing this.

Anthony, nice setup! To your question about the rental mortgages, you haven’t said what interest rate you are paying. As a start, if you are paying more than the risk free rate (Treasury bills) which you probably are, then a true apples to apples comparison would be yes, pay off the mortgage. But, if you are comfortable taking more risk, you have other options to invest in which you *hope* will yield you more over the coming years. You also didn’t say whether the rentals generate net income and if so, how much? What is the implied rate of return on the equity you have invested in them? If you pay the mortgages off, you’ll have even more equity tied up, will the extra net income make that worthwhile? Maybe you should use the money to buy more rentals instead, if purchase opportunities still exist in your town. … this is less of an answer than a framework to analyze the decision, hope it is helpful.
If you’re a retired or disabled farmer, you’re treated as materially participating in a farming activity if you materially participated for 5 or more of the 8 years before your retirement or disability. Similarly, if you’re a surviving spouse of a farmer, you’re treated as materially participating in a farming activity if the real property used in the activity meets the estate tax rules for special valuation of farm property passed from a qualifying decedent, and you actively manage the farm.
Passive income investments can make an investor's life easier in many ways, particularly when a hands-off approach is preferred. The four options outlined here represent differing levels of diversification and risk. As with any investment, it's important to weigh the anticipated returns associated with a passive income opportunity against the potential for loss.
One of his favorite tools is Personal Capital, which enables him to manage his finances in just 15-minutes each month. If you sign up and link up an investment account with $1,000+ within 40 days, you get a $20 Amazon gift card. They also offer financial planning, such as a Retirement Planning Tool that can tell you if you're on track to retire when you want. It's free.
​I’ve been into home décor lately and I had to turn to Etsy to find exactly what I wanted. I ended up purchasing digital files of the artwork I wanted printed out! The seller had made a bunch of wall art, digitized, and listed it on Etsy for instant download. There are other popular digital files on Etsy as well such as monthly planners. If you’re into graphic design this could be an amazing passive income idea for you.
Another way to generate passive income is to invest and be a silent partner in a business. This is very risky, but with risk comes the potential for high returns. For example, several years ago both Lyft and Uber were looking for private investors to invest in their companies. Today, they are worth billions - but you as an investor would only reap that benefit if they go public via an IPO, or get acquired. So, it's risky.
Another form of passive income can come from investing in private equity opportunities in businesses that are growing.  There are certain limitations on who can invest, but can be a great way to generate passive income from profits in a business that you have very little if any active role in.  If you invest in and now own part of the business, and it is successful, you would then be entitled to regular profits from the business, and potentially even a great return on your original investment.  You can do this by either purchasing some of the business with your money, or lending your money at a certain interest rate to the business.

Haha, that is too funny. I wanted to make an app back in the day called “MyShares” (You can probably tell how I cam up with the name at the time). The idea was that I would loan out books and DVD’s and then would never get them back. Then I thought, how cool would it be if I could rent those items out and that would motivate people to bring them back. Obviously, books and DVD’s are cheap, so this isn’t the money maker. The idea that would probably make the most money would be things like tools, ATVs, etc.