keep a lil air freshener over by the squat rack for the muscle heads who fart and shit on heavy leg day
and some barf buckets nearby too.
dont forget you have to pay a lot for advertising. I get fancy post cards from all the gyms in the mail every month, I'm in business too and I know that costs a lot.
plus:
heat
electric
phone lines (multiple)
insurance
water
yellow pages
I know you have thought of all this and not trying to insult your intelligence but all this shit usually costs a lot more than you first thought.
ANYWAY ---GO FOR IT--- else you'll never know.
If you have the up-front capital then go for it big time.
AND---->sell memberships while you're under construction <----that's super important!