questions about an existing window in a room within a garage

hello there! i am renting a house in los angeles and the landlord has given me permission to build a room within a room inside the two car garage as long as i don't do anything to the original structure. this shouldn't really be a problem since it's a room within a room and i can just tear it down later since it won't be touching any of the original walls or ceiling. the original structure is a finished garage with painted drywall walls and windows etc. here is my question - there is a 94 inch wide window that opens on both sides. it's dual pane glass. i KNOW my best option for sound is to fill in the original window with something i can remove later and to not have any windows in my own construction but i have a view that is absolutely breathtaking. if i have to spend 14 hours a day every day inside a box i'd be much more inspired looking out into a beautiful view than at a wall. so that being said, i want to have a window inside my room within a room that lines up with this original window to maintain my view. i've read up, searched this forum, etc but considering that this isn't just a new build or a situation where i am free to remove the existing window and replace it i am not sure what my best option is for treating the existing window and then building one of my own. (FYI there will be roughly 14 inches between the original wall with the window and the outside wall that i will be building). any advice would be GREATLY appreciated. thank you so much!!

if the interior window on the room is far enough away (3-4ft), you're likely to be OK. you'd have to beef up all the other walls (?) and/or add a heavy glass plate over the existing window - yes, its likely to be triple leafed but probably better than not doing it.

Glenn, thanks a lot! what if i only have 14 inches though??

Any idea how thick the existing glass is? Is that an operable window? If it is reasonably thick and well sealed, then you might be able to get away with it as-is. If not, then maybe you could build a "glass plug" that fits tightly in the existing frame, and has a thick, heavy piece of glass in it. Kind of like a normal window plug, but instead of plywood or MDF, you have a pane of glass in it. Seal it in place well. You can then remove it if/when you leave. Then you would have another thick/heavy pane in your actual inner-leaf wall, 14 inches away, and you should be fine. Yeah, that is a three-leaf window, but if the other two leaves are massive enough, and with a 14" gap, you should probably be just fine with that. Sometimes the only solution is a wicked, evil 3-leaf, but as long as you have big mass and air, it will work. Any photos of the existing window? - Stuart -