How do you grow a 3 year old church of 40 regular attendees without modifying doctrine or practice?

Andre asked the question: I will accept answers from the spiritual to the practical…
-Pastor has stated that he could handle up to 200 members.
-Reformed Presbyterian/Calvinist, affiliated with larger denomination.
-1 full time pastor
-Church is located in an urban area in the midwest. “rents” space from another church.
-Meets twice on Sunday for worship, once [...]