Here is the floor plan for #4G by itself:
And here you can see how #4G and #4GG were once one unit, which could provide the blueprint for combining them once again (click to enlarge):

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The space can surely be configured to give each of the family’s three sons his own bedroom. Maybe convert the old staff quarters or some of the copious closets into bedroom space. But don’t give any of the kids a view of Central Park; save that for the master bedroom. This photo of the view isn’t the greatest because the trees are bare, but imagine what it must look like in the spring:
The Ostlings spent a total $6.9 million on the two apartments — $3.1 million for #4G, $3.8 million for #4GG — and they’ll easily spend another million on the renovation. But when they’re done, they’ll have a trophy property that will surely be worth their investment of time and treasure.

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Renovating an apartment in a pre-war co-op like the Beresford can be costly and complicated. But as a Wachtell Lipton M&A partner, Greg Ostling has experience with large and complex matters. Congratulations to the Ostling family on their new home, and good luck to them in the renovation process.
Goodyear Heiress Sells Co-op on Central Park West for $3.8 M [New York Observer]
“You cannot be serious!”: Tennis whiz John McEnroe sells Beresford home [The Real Deal]
211 Central Park West 4-G/4GG [StreetEasy]