Talk:New York Properties/@comment-3074036-20100919114711/@comment-3069692-20101007065236

Those achievements or converting to vegas cash are the only reasons to care at all about new york cash once the rest of the city is done.

Upgrading further depends on your long term plans with the game (and those achievements). If you set up an excel spreadsheet you can compare the cost of the next upgrade with the amount of time the extra cash will take to pay off the upgrade cost. From there you can keep upgrading until that point becomes further in the future than you can honestly see yourself playing the game. For example you can upgrade to the point where another upgrade will take a full year to pay itself off, this gives long-term profitability and will aid in getting the big cash achievements.

It is far more important to consider the long term profitability of upgrading than how much the upgrade actually costs... because given enough time the cost is irrelevant.