I have also had some big repairs like electric panel upgrades to accommodate the higher number and usage of electrical devices.

Tenant is liable for animal damages, must pick up after dog poops, clean out their kitty litter box regularly, obey leash laws, etc etc etc...(4) Have your lease amended saying if a tenant is prescribed a ESA during their lease they must first clear it with you and provide documentation and allow you to verify, failure to obtain written permission from landlord prior to introducing an ESA is a lease violation.(5) Also clarify that if an accommodation is a no pet accommodation, an verified and documented ESA requires the landlord to waive the no pet clause, only for that specific ESA. 

. - 4 showers and 5 toilets minimum- Minimum square footage needs to be at least 3000 to accommodate everything they need.

Also, tough to find neighborhoods that can accommodate enough parking spaces/areas if you have a bunch of individual renters.

As they grow (they start with 6 people, but the office can accommodate 20 calling stations):1.

But there is a hybrid approach that would accommodate what both you and Toby are saying.Because the rule is that you must have lived in the property for 2 out of the 5 years immediately prior to selling you actually have a potential additional 3 years to turn that into a rental if you want and still sell taking advantage of the primary residence exclusion.So, assuming you've already lived in it now for 2 years you could move out and rent it for 3 more and still qualify for the exemption. 

Land must either have access to water/septic/utilities or accommodate well and septic and be close enough to run utilities3.

Can I accommodate and extra child (Sure!)

I read the HUD guidelines on ESA and LLs must do reasonable things to accommodate ESAs and service animals.  

You could do rent + utilities or the preferred method (like most members mentioned here), increase the rent to accommodate.