need AWK help: lowercase, trim trailing spaces

[Mario Dona]

HELP! I have a situation that just cries out for an awk solution, however
I'm at a loss over some minor, but important details.  I have a list of
companies that need to be preprocessed before sending them to our typing
department.  A simplified portion of the input file as follows:

COMPANY1  2800 FULLING       P O BOX 3608     HARRISBURG PA           17105
COMPANY2  500 ELM                             MILWAUKEE WI            53122
COMPANY3  13500 CENTRAL      P O BOX 655303   DALLAS TX               75265-5303

^         ^                  ^                ^                       ^
|         |                  |                |                       |
1         11                 30               47                      71


My mission, which I chose to accept, was to reformat the list so that it looks
like this:

Company1
28 Fulling
P O Box 3608
Harrisburg PA 17105

Company2
500 Elm
Milwaukee WI 53122

Company3
13500 Central
P O Box 655303
Dallas TX 75265-5303

Using the SUBSTR function to get the parts I want was trivial; the problem
is, I can't figure out:

1.  How to prevent blank lines from printing if there is nothing to print
    (e.g. the second address in COMPANY2 above).
2.  How to concatenate the city and zip fields as shown.
3.  If a word is greater than 2 characters, lowercase all letters
    except for the first character (this is to keep state capitols 
    capitalized).

My feeble attempt so far is shown below.  If anyone has any ideas, I'd be
much obliged.

BEGIN   {
        RS="\n"
        }
{
name=substr($0,1,10)
address1=substr($0,11,19)
address2=substr($0,30,17)
city=substr($0,47,24)
zip=substr($0,71,10)
printf("%s\n%s\n%s\n%s\n%s\n\n", name, address1, address2, city, zip)
}

  Mario Dona
  ...!{ !decwrl!qubix, ames!oliveb!tymix, pyramid}!wjvax!mario         
  The above opinions are mine alone and not, in any way, those of WJ.