Hi Brian,
Try this code.
Note: you can't put the default value of JOF into a file that will be loaded 
automatically when ant is run, such as (home)/.antrc,
as that would set JOF before your code executes. First set works, last set 
fails.

On the other hand, you could set "JOF_default" in a properties file that is 
loaded before this code is run, then have an "else" clause in your condition to 
use it when BUILD_BOX is not set in your environment:
  <condition property="JOF" value="F:/Inetpub/wwwroot/wo30" 
else="${JOF_default}">

Rob

------------ simplified code ----------
<?xml version="1.0" encoding="utf-8"?>
<project name="plugin-rules" basedir="." default="setJOF">
  <target name="setJOF">
    <property environment="env"/>
    <echo>BUILD_BOX = ${env.BUILD_BOX}</echo>
    <condition property="JOF" value="F:/Inetpub/wwwroot/wo30">
      <isset property="env.BUILD_BOX"/>
    </condition>
    <echo>JOF = ${JOF}</echo>

    <property file="jof.properties" />
    <echo>After Property file, JOF = ${JOF}</echo>
  </target>

</project>
---------------- output of test run - no build-run ---------
C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>set BUILD_BOX=

C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>echo %BUILD_BOX%
%BUILD_BOX%

C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>ant -f jof-test.xml
Buildfile: C:\Documents and Settings\rechlin\My 
Documents\test\TEST-ant\jof-test.xml

setJOF:
     [echo] BUILD_BOX = ${env.BUILD_BOX}
     [echo] JOF = ${JOF}
     [echo] After Property file, JOF = C:/Inetpub/wwwroot/wo30

BUILD SUCCESSFUL
Total time: 0 seconds
------------------------ output of test run with BUILD_RUN set in the 
environment ---------
C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>set BUILD_BOX=true

C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>echo %BUILD_BOX%
true

C:\Documents and Settings\rechlin\My Documents\test\TEST-ant>ant -f jof-test.xml
Buildfile: C:\Documents and Settings\rechlin\My 
Documents\test\TEST-ant\jof-test.xml

setJOF:
     [echo] BUILD_BOX = true
     [echo] JOF = F:/Inetpub/wwwroot/wo30
     [echo] After Property file, JOF = F:/Inetpub/wwwroot/wo30

BUILD SUCCESSFUL
Total time: 0 seconds
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