for me, the ones that cashflow the most are the ones that I bought with 3% long term debt, they were new (low maintenance) and they are in high appreciating areas(just a bonus but does not impact cashflow).

I'd recommend speaking with local specialists in your target market to look at multiple investment options side-to-side.Lastly, some of my clients have been encouraged to stay away from HELOCs unless they expect a lump sum (inheritance, sale of other asset, bonus, etc.) to pay off the HELOC in the next year or 2. 

Yes they are a nice bonus, but you could find yourself on the end of a lawsuit due to a guest getting injured or even killed.

More work, more time but you can take advantage of a nice cost segregation / bonus depreciationThis is the truth! 

Remember, investing 200,000 into an ADU won't likely increase your properties value by 200,000, but the rent potential is a great bonus.

@Cate DeBates Triple Net commercial lease is a huge bonus!

That one will take a year, but then it will get 25K a month on 2.5M, and there is an RV park as a bonus.   

Bonus if you have any advise or pools. 

But it also means you have virtually zero bargaining power as the seller can reuse any and all repairs and just keep your 6 months of rent as a bonus. 

If you go with the partnership route1) You need to manage the money going in and out of the business bank account.2) File a partnership return and be responsible for issuing K-1's3) make distributions to you and your partner for cash flow that you receiveYou will likely spend many hours on a nice gesture.I may want to consider instead to give a christmas gift or a bonus for early completion of projects.