New York ( CNN ) -- Given the pedigree of 740 Park Avenue 's past and present residents -- John D. Rockefeller Jr. , philanthropist Irene Guggenheim , designer Vera Wang and businessman David Koch , to name a few -- it 's no surprise the jewelry taken in several thefts since May is primo stuff : . -- His and hers Patek Philippe watches , a Rolex watch and diamond earrings and a diamond necklace ( more than $ 100,000 total ) -- Diamond bracelet and rhinestone pin ( $ 82,400 ) -- Two diamond earrings and other jewelry ( $ 53,000 ) -- A $ 7,500 wrist watch . New York City Police are investigating grand larceny robberies at the most exclusive of Manhattan addresses . There were no signs of forced entry , according to Sgt . Carlos Nieves . The building 's real estate firm , Brown Harris Stevens , also is investigating , said Amy Gotzler , senior vice president of communications . New York tower is burglar 's gold mine . Police are focusing on four robberies that occurred while residents were on vacation , between May 30 and July 30 . Completed in 1930 , 740 Park Avenue also was home to the parents of Jacqueline Kennedy Onassis . Current residents include business magnate Steve Schwarzman . Some of its 31 units have sold for as much as $ 29.9 million , according to Michael Gross , author of `` 740 Park , '' billed as the inside story of New York 's richest , most prestigious cooperative apartment building . `` In the last 30 years , it has developed a reputation as one of the strictest , hardest to get into , most exclusive , '' Gross told CNN on Thursday . `` 740 Park means that you 're there . You 're it . '' Retired jewel thief Walter Shaw , author of `` A License to Steal , '' said he believes the thefts are an inside job . `` Because if they go back to the surveillance tapes and cameras , they 're gon na see that they do n't recognize anybody that does n't belong there , '' said Shaw . Shaw was in the business for 30 years and is said to have netted $ 70 million in goods with his crew , dubbed the `` Dinner Set Crew '' because it robbed folks while they ate in a different part of the house . He served nearly 12 years and was released in 1986 and later produced movies . According to Shaw , he and his team never did `` high-rise '' jobs because there was only one way in -- and one way out . `` I would think it 's somebody that knows the building pretty well and knows the shift changes and knows the comings and goings of the maid service or construction being done , and they blended in , '' said Shaw . Gross speculates that whoever robbed the apartments did so by locating each individual apartment 's key box . `` Now you 've got four unrelated families all during summer vacation -- when no one 's around -- ( and ) someone managed to get in with no signs of break-in . Hello ? That means keys . Where are the keys ? They 're in the key box . '' Related : Insurer Lloyd 's offers million-dollar reward for clues in Cannes jewel theft . CNN 's Vivienne Foley contributed to this report .
Someone has been stealing cars at a swank Manhattan address . Police say there were no signs of forced entry at 101 Park Avenue . Residents of 31-unit building include Vera Jones , David Cross .