If you rent property to a trade or business activity in which you materially participated, net rental income from the property is treated as nonpassive income. This rule doesn’t apply to net income from renting property under a written binding contract entered into before February 19, 1988. It also doesn’t apply to property described earlier under Rental of Property Incidental to a Development Activity .
I agree mostly with the real estate advice. I’m looking for ways to take advantage of the condo I own to get up the rent from ~$0.90/ft to the $1.2-1.5/ft that seems more like the range in the same area. I’d have to put in a bit of capital (probably 10k on the low end for just the basics up to 40k if I wanted to remodel the kitchen and 2 bathrooms up to par with the area), so the return is likely there if those upgrades warrant $1.30/ft (given the unit is larger than most 2br/2ba in the area).
Investing in coins and collectibles: Buffalo nickels and Spiderman comic books are good examples of coins and collectibles that can rise in value, and thus offer opportunity for passive income investors. You'll need to get up to speed on the value of any coin or collectible under consideration, but once you do so, you're on the way to price appreciation on a commodity you'll be paying a lower price to buy, and will garner a higher price when you sell.
Nonetheless, there is still benefit to capturing the losses on a tax return.  When you sell a primary residence, up to $500,000 of capital gain for a married couple ($250,000 for a single person) may be excluded.  Unfortunately, rental properties are not awarded this gain exclusion.  Instead, any losses that the property generates over the years can be accumulated and offset with the gain upon disposition.
If you need cash flow, and the dividend doesn’t meet your needs, sell a little appreciated stock. (or keep a CD ladder rolling and leave your stock alone). At the risk of repeating myself, whether you take cash out of your portfolio in the form of “rent”, dividend, interest, cap gain, laddered CD…., etc. The arithmetic doesn’t change. You are still taking cash out of your portfolio. I’m just pointing out that we shouldn’t let the tail wag the dog. IOW, the primary goal is to grow the long term value of your portfolio, after tax. Period. All other goals are secondary.
Self-publishing belongs firmly at the top of any passive income ideas list. Amazon, with Kindle Direct Publishing (electronic version) and CreateSpace (print on demand version) dominates the self-publishing world. It’s both good and bad. Good in that they’re quite generous with their commission rates (usually 70%). Bad in that they can change their policies at any time to be less favourable for authors and there is nowhere else for us to go. That’s not entirely true. There are a few other options, but none of them are as good as Amazon!
Case Schiller only tracks price appreciation of RE. RE as rental investment vehicle is measured primarily on rental yield or cap rate or some other measure. Price appreciation in that scenario is only a secondary means of growth, and arguably should be ignored as a predictor of returns when deciding on whether or not to invest in rentals. More important key performance indicators for rentals are net operating income and cash ROI. Appreciation, if it occurs, is a bonus.

If your passive activity gross income from significant participation passive activities (defined later) for the tax year is more than your passive activity deductions from those activities for the tax year, those activities shall be treated, solely for purposes of figuring your loss from the activity, as a single activity that doesn’t have a loss for such taxable year. See Significant Participation Passive Activities , later.

My goal is to generate enough passive income (ultimately; for the next few years, I’m definitely working for it both with a day job and property managing my investments) to do what I want, when I want, how I want, and where I want. We all define that “what, when, how, and where” differently, and to each of us, financial freedom means something different.
When I did her recent tax return she had $45,000 in passive losses from the rentals and $35,000 in income from her S-Corporation. I called her and found out how many hours she had only worked for three months in her S-Corp, which was less than 500/750 hours per year.  I changed the nature of the income from the S-Corporation to passive, thereby eating up the passive losses from the rental. 

This one may seem simple, but that’s only because it is. If you were to move your savings from a traditional, brick-and-mortar bank with a low-interest rate and into a high-yield savings account online, over time you can make a surprising amount of extra cash. Online banks are FDIC-insured just like the traditional brick-and-mortar institutions, so your money is just as safe.

Self-rental situations are not just limited to buildings. You could lease your car to your S corporation. No, this isn’t the same as leasing a car from a dealership. This is where you own a piece of equipment, let’s say an automobile, and you lease it back to your business for your business’s use. Sounds exotic, but it is quite simple. More about this in a later chapter dedicated to fringe benefits and tax deductions.

1. The batting cage idea is very risky. I’ve seen many of them close over the years and it is not anything close to passive income if you want to keep the business going. You have to continually promote it and target youth leagues, coaches, schools etc to catch all of the new players who grow up and want to play. I’ve played at probably 8 batting cages over the years and 7 of them closed.