Pretty much anything in my area that has to do with real estate makes money. The rental storage units will be way less headache than renting. If you have apartment complex you will be in court a lot, lol. For sure stay away from food business highest failure rate in the U.S.. Flipping houses takes time and some knowledge of the building process. I only did one from my daughter and one for my son. Daughters took a year because I was working full time but did sons in about 3 weeks. New wiring, new plumbing, floors, all new paint.
If you look at the storage get lots of quotes from suppliers. They all want to say they have a special deal that someone just backed out on. That is just a line they give everyone. When I did garage I got a red iron frame with 6" insulation for less that I was quoted for just a pole barn by one supplier. Go back and forth at least 4 times and 4 or 5 quotes.
It is not easy but investing in China in the past has paid big dividends. Getting there to find the place to invest is difficult.
I lived in China for 17 months. I did not have money to invest due to having two divorces and starting over with zero twice hurts.
A friend of mine is still there been there 8 or 9 years now. We both worked in the tooling trade, metal stamping dies. We both worked for a Chinese company owned by three Chinese investors.
I only signed a one year contract I had a goal to make the money to pay off home and garage and that is what I did.
They wanted me to stay and tempted me with bonus offers. The normal pay in China is you work 12 months but get a Christmas bonus of one months pay so 13 months pay per year is normal. Also some of the top employees got bonus based on how well the jobs went. For instance our head designer was Chinese and the year I was there his bonus was just over $1,000,000 USD. Yes million. It is a fable about cheap labor, he was in his 40's. They offered to put me in the bonus program but I said not and came home.
Now my friend that stayed ended up taking another job in the south of China. He did that for another year or so and then an American / Canadian company convinced him to manage all the tooling being built in China.
As he traveled to different shops in China he had the opportunity to buy into a check fixture shop. He put in $100,000 and after 12 months had his money back. He now receives over $100,000 each year and does not even work there just a silent investor. He also has bought several apartments that gained in value in Shanghai. He married a Chinese gal also, lol. She had retired in her 40's was a previous business owner in Shanghai. I think I read in the paper in Shanghai that walking down the street in Shanghai ever 350 th. person you pass is a millionaire. They sell over 24 million cars a year in China. It is not the poor third world country most Americans have in their mind.
Just my thoughts.
Cheers,