In my opinion, investing in real estate such as apartments is different from investing in land. Real estate investment is a wise choice but has risks that must be considered. Events such as natural disasters or changes in city planning can significantly affect asset prices. And the biggest drawback of real estate is the maintenance costs that must be incurred every year. If real estate can make a profit, maintenance costs can be taken from the profit. But if real estate does not make money, you still have to pay maintenance costs from your own pocket. This is different from buying land where you will not have any additional costs.
Owning land without developing it has it's own disadvantage because the government can reclaim the land. I don't know how things work in your country but for mine, the government are the owners of all land and after you buy it, they can still reclaim it for major city developments. This is way most people in my country develop their land by building structures on it like rental apartments or shops. Real estate are good ways to diversify your investments because despite you spending money from your own pocket to maintain your apartments, you can make everything back when you get clients to rent out your building to. You can add your maintain fees and this is going to help you recover the losses you had before having client to rent your apartments.