I am gonna answer this one myself: for foreigners it is very easy to get access. You will be waiting to be picked up at a reception, go through security and deposit your belongings with them (including cell phone/ cameras), fill out a form, pay 600 Taka. You absolutely need your passport. You then will get a tour of the interiors. Mine was private, about 90min and quite good. I don't see any advantage of trying to arrange this in advance as it is pretty straightforward when you just show up. No interior photography unfortunately.

Its quite easy part,just show up and tell the security officer to call visit section via intercom and they will let you in while are inside there will be a guide who will show you around just need to pay BDT 600 and your fill up a form with your passport photocopy.Its legal to see around and inside.No camera will be allowed. If any problem find me.I will help. Thanks.& enjoy it.

Its the Bangla Parliament house and seat of the govt. Louis Kahn was the architect and it is surrounded by a huge garden and lawns. Visitors can view from the street ,but cannot wander in unless you get special permission which is rare.Its a unique modernistic design but seems out of place in a city like Dhaka. But importantly the surrounding greens provide some respite to the locals ,even though the place is littered with trash.