There could also be external threats. Maybe other villains or rival ninja clans see the apartment building as a target. They might try to take it over or destroy it to undermine Naruto's influence in the village. Naruto would then have to use his combat skills and strategic thinking to protect his property.
One challenge could be dealing with competitors. If his company is in a competitive field like ninja training, there might be other established companies or individuals who see him as a threat and try to undermine his business.
Perhaps it's a community building. Naruto is a very community - oriented person. He could own a building that serves as a place for the villagers to gather, like a community center. There could be a cafeteria, a place for kids to play, and rooms for meetings and celebrations.
One possible storyline could be Naruto renovating the apartment building to make it a better place for the villagers to live. He might use his ninja skills to do some unique construction work.
He might face internal conflict. Naruto has always been an open and honest person, so keeping such a big secret could go against his nature. This could lead to him struggling with his conscience. Also, he would need to balance his normal life with his secret Hokage duties without raising suspicion. For instance, he can't always disappear suddenly to attend to Hokage business without people getting curious.
Well, he might face challenges like dealing with cheaters. People in the Naruto world have all kinds of abilities, and some might use ninjutsu to cheat at the casino games. Another challenge could be competition from other illegal gambling dens. If his casino is legal, he has to compete with the illegal ones that might offer more 'attractive' deals to customers.
One challenge could be controlling the transformations. If he can't master when and how to transform, it could put him in dangerous situations. For example, transforming at the wrong time during a battle could leave him vulnerable.
Naruto would face quite a few challenges. For one, his growth might be stunted as the team overprotects him. He could also face ridicule from outside the team who might see him as a weakling now. Moreover, he has to deal with the internal team dynamics where Sasuke may not be fully accepting of his new role and Naruto would have to prove himself constantly.
One challenge is trust. Not everyone will immediately believe in Naruto's intentions. Some may think he is trying to gain power for himself. Another challenge could be resources. Feeding, housing, and training an army requires a lot of resources. He needs to find ways to get enough funds and supplies.
One challenge could be adapting to the team's dynamics. Team 8 has its own way of operating, and Naruto is used to his own style with his friends. For instance, they might be more methodical in their planning, while Naruto is more of a 'jump - in - and - figure - it - out' type. So, he'd have to learn to follow their lead sometimes.
He might face challenges like finding the right place to plant the tree. Konoha has a lot of regulations about what can be planted where. Also, he needs to make sure the tree gets enough water and sunlight. If it's a magical tree, he may not know exactly what it needs to grow well.