SIM LIM Tower is located near Rochor MRT. It has many shops and also BLS India (where you need to go currently to submit India visa applications).
The pathway from Rochor MRT to the building is accessible for wheelchair users. But the building is not very accessible since there are many steps at the entrance. Currently the only way to enter is through the car park entrance. It is very slope-y, but if you can manage it, it takes you to the lifts in Level 4. However, there's car park barrier so you have to squeeze thru the sideway. Only narrow wheelchairs can go thru.
Once inside, you can take lifts to reach all floors. The lift call buttons are not waist level though.