Inserting Line Breaks into SQL function return string

Using SQL Server 2008, I have a function that creates a string of account numbers and addresses.  I want to put a line break between each account/address string, but cannot make it happen.  I've tried adding CHAR(13) and CHAR(10) without success.  The output I want should look like this:

12345 - 123 street name
54321 - 321 street name

But it's coming out like this:

12345 - 123 street name 54321 - 321 street name

FUNCTION [dbo].[ActiveAccountStrings] 
(
	@pClientID varchar(50)
)
RETURNS varchar(255)  
AS
BEGIN
declare @accounts int
declare @cnt int
declare @accountstring varchar(255)
declare @lastaccount varchar(50)
declare @lastaccountid int
declare @siteaddress varchar(255)

DECLARE @LINEBREAK AS varchar(2)
SET @LINEBREAK = CHAR(13) + CHAR(10)

select @accounts = count(*) 
 from ppaccounts pp (nolock) 
 inner join tiebacks t (nolock) on t.tiebackid = pp.tiebackid and t.clientid = @pClientID 
 where pp.status = 'A'

select @cnt = 1
select @lastaccount = ''
select @accountstring = ''
select @lastaccountid = -1

while (@cnt <= @accounts)
begin
  select @lastaccount = min(pp.account) 
  from ppaccounts pp (nolock) 
  inner join tiebacks t (nolock) on t.tiebackid = pp.tiebackid and t.clientid = @pClientID
  where pp.status = 'A' and pp.id > @lastaccountid
  
  select @lastaccountid = pp.id 
  from ppaccounts pp (nolock) 
  where pp.account = @lastaccount
  
  select @siteaddress = pp.ppsiteaddress 
  from ppaccounts pp (nolock) 
  where pp.account = @lastaccount
  
  if @accountstring <> '' 
  begin
    select @accountstring = @accountstring + @LINEBREAK + @lastaccount + ' - ' + @siteaddress
  end
  else
  begin
    select @accountstring = @lastaccount + ' - ' + @siteaddress
  end
  select @cnt = @cnt + 1
end

return @accountstring

END

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