It would be nice to be able to put some gold towards land or buildings instead of having to pay it all at once. Kind of like a down payment? *I'm not sure if someone suggested this already, I didn't want to scroll through each page so I'm sorry if this is a repeated suggestion.
And maybe once the down payment is payed you will get billed a portion of the remaining amount every week(?) And if you don't pay the bill you cannot buy anything in the game untill you do.