At 1050 per unit that is already 75% occupied, you are looking at a great potential property.
If your looking to ask LOTS of question here are a few questions I would would ask.
-Ask if you can speak to the current residents and ask them how long they plan to stay, if they are happy with the rental property, etc.
-Ask if the building is up to code and ask if there are any repairs that will need to be done immediately or in the near future. Buildings that are older then 20 years will usually require some maintenance such as plumbing, AC replacements, etc but the rent should easily cover those expenses.
-One of the biggest things you should ask is if the tenants pay 1050 a month and utilities or will you be responsible for payment of the utilities? Some tenants will keep lights on 24/7 and leave AC's running on high 24/7 resulting in high electric bills as well as frequent AC repairs so keep that in mind as that can hamper your income. tenents that pay their own utilities are usually more frugal with utilities and don't leave AC's on for long periods of time.
Good Luck! hope everything goes well!