Ballpark estimate for these renovations

30K, 1 month

50k?

1.) $5,000 - $7,000
2.) $10,000 - $13,000
3.) $8,000 - $10,000
4.) $3,000 - $5,000
5.) impossible to estimate unless size/shape is provided.

So I would agree with the $30K - $50K range above (including building/DOB fees, contingency, etc.)...

I think 40-50k. The first two will cost over 20k alone.

Can you even replace windows in a highrise building yourself?

I would say around 40k
Its sounds like a lot but keep in mind you have to get licensed people that are approved by the building to do all the work.
Most of the cost will be labour.

Nice floor costs 20/sf, just the materials of the floor will be 13k

I am not sure how anyone can even throw out prices without knowing how many windows you are replacing and what type of windows are you installing?

I am not sure why people say... "how much will it cost"...

The right way to approach anything is... I have X dollars, can it be done for X.

What if they say it can't be done for X, but it can be done for X+1? Do you now have to walk to save face?

What if it actually would have cost X-2, now you got to suck it up, right?

Thank you all for your input. I was hoping to spend at most 30k - popcorn ceiling removal and floors are musts, so I will just have to allocate whatever I have left accordingly. Again this is just to gauge how much I should adjust my offer.

HVAC - currently there are floor HVAC units with metal casing. How much would it cost to build a wood cover over the existing one? or to replace the metal casing?

Windows would be a nice to have - I was hoping to update the frames and maybe city windows, 3 panes in the BR and 2 panes in the LR. What would be the typical cost for one pane + frame? Or is it possible to just replace the frame?