First rental property to buy many

If there was a property listed for 150 000 and you had 150 000 would you pay it in full or get a loan for 10% if the goal was to use the rent from that property was to pay off future house purchases. The rent would be 2500 - 3000 and loan is over 10 years at 4%. What would you do if your goal was to have 200k/month in 30 years from now from rentals.