I My goal is to have a cash flow. 

Currently Renting (Sold a fix n flip a few years ago) looking to buy land with cash (30k or so) and put a new modular home.

Purchase price: $600,000 Cash invested: $30,000 Purchased single family home, finished basement making the property a duplex.

I would rent both units out and should get $350 in passive cash flow. 

IF you plan on going back someday, and this is the home you want to move back to, then renting it would be a good idea as long as you estimate that it will cover itself, or preferably, cash flow, which it appears that yours will at @ $2K or so per month (after expenses). 

If you own (2) properties free and clear you could simply do a cash out refinance. 

Purchase price: $275,000 Cash invested: $275,000About this homeBeautiful 2 bedrooms 1 bathroom condo in the convenient location of Rowland Heights, close to bus stop, supermarket, schools, shopping centers etc. newer counter top in kitchen and bathroom. 2 parking spaces and storage room.

He pockets the downpayment to cashout what little cash he puts into the deal and then makes the spread between the two loans.

Quote from @Aishan Gonaduwage: I am seeing good deals in Detroit that could cash flow in the current market.

I understand they can make our life a lot easier but is it worth it if it eats up a lot of our cash flow?