[R] Subtracting one based on an If

[LCOG1]

For the following:

 Bldgid<-c(1000,1000,1000,1001,1002,1003,1003,1003)
 Maplot<-c(20000,20001,20002,30000,30001,40000,40001,40002)
 Area<-c(40,170,160,50,100,100,90,110)
 #Construct Sample dataframe
 MultiLotBldgs..<-data.frame(Bldgid,Maplot,Area)

CondoLots_ <- tapply(MultiLotBldgs..$Maplot, MultiLotBldgs..$Bldgid, length)


CondoLots_ Returns:

1000 1001 1002 1003 
   3    1    1    3 

What i want to do is to subtract 1 from the above for all cases where there
are more than one, so that  CondoLots_ returns:
1000 1001 1002 1003 
   2   1    1    2

I have tried 

for(i in 1:length(CondoLots_)){
ifelse(CondoLots_>1){ 
     CondoLots2_<-CondoLots_-1
    }

                             }
But it doesnt seem to work properly.  I think this should be simple.

Thanks in advance.
JR
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