tmp.R

library(magrittr)
library(plyr)

l <- structure(list(`4` = c("Dining Room", "Pre-War", "Laundry in Building", 
                            "Dishwasher", "Hardwood Floors", "Dogs Allowed", "Cats Allowed"
), `6` = c("Doorman", "Elevator", "Laundry in Building", "Dishwasher", 
           "Hardwood Floors", "No Fee"), `9` = c("Doorman", "Elevator", 
                                                 "Laundry in Building", "Laundry in Unit", "Dishwasher", "Hardwood Floors"
           ), `10` = list(), `15` = c("Doorman", "Elevator", "Fitness Center", 
                                      "Laundry in Building")), .Names = c("4", "6", "9", "10", "15"                            ))
l

## $`4`
## [1] "Dining Room"         "Pre-War"             "Laundry in Building"
## [4] "Dishwasher"          "Hardwood Floors"     "Dogs Allowed"       
## [7] "Cats Allowed"       
## 
## $`6`
## [1] "Doorman"             "Elevator"            "Laundry in Building"
## [4] "Dishwasher"          "Hardwood Floors"     "No Fee"             
## 
## $`9`
## [1] "Doorman"             "Elevator"            "Laundry in Building"
## [4] "Laundry in Unit"     "Dishwasher"          "Hardwood Floors"    
## 
## $`10`
## list()
## 
## $`15`
## [1] "Doorman"             "Elevator"            "Fitness Center"     
## [4] "Laundry in Building"

x = l %>% 
  lapply(as.list) %>% 
  lapply(as.data.frame, stringsAsFactors = FALSE) %>% 
  do.call(rbind.fill, .)
x[] = !is.na(x)
x

##   X.Dining.Room. X.Pre.War. X.Laundry.in.Building. X.Dishwasher.
## 1           TRUE       TRUE                   TRUE          TRUE
## 2          FALSE      FALSE                   TRUE          TRUE
## 3          FALSE      FALSE                   TRUE          TRUE
## 4          FALSE      FALSE                   TRUE         FALSE
##   X.Hardwood.Floors. X.Dogs.Allowed. X.Cats.Allowed. X.Doorman.
## 1               TRUE            TRUE            TRUE      FALSE
## 2               TRUE           FALSE           FALSE       TRUE
## 3               TRUE           FALSE           FALSE       TRUE
## 4              FALSE           FALSE           FALSE       TRUE
##   X.Elevator. X.No.Fee. X.Laundry.in.Unit. X.Fitness.Center.
## 1       FALSE     FALSE              FALSE             FALSE
## 2        TRUE      TRUE              FALSE             FALSE
## 3        TRUE     FALSE               TRUE             FALSE
## 4        TRUE     FALSE              FALSE              TRUE