A lot of big ones like Keller Williams have very extensive training programs that will help you out.

For instance, get your real estate license and do leasing for that company on the side for extra income. 

I think I would ask @Jerryll Noorden (I think he uses carrot) but he is a wholesaler/flipper that has posted extensively about website traffic and marketing and is very knowledgeable in that area

For instance we financed our Duplex through an FHA owner occupied loan. 

I don't own commercial but did some pretty extensive research in anticipation of a 1031 from apartments into various retail or office types.

So I have made it difficult and time consuming so that they will won't want to waste the extensive time it would take to try and win a suit against me. 

That would be for extensive selling not just using.

For instance, in one building the tenants might pay all utilities, while in another the utilities might be master metered for the owner to pay.

if an extension could be $10,000 up to $150,000Fire Hydrantif needed, $3,000Sewerif needed: $5,000 plumbingSewer Lineif needed; $10,000 up to ????

South Dakota, for instance, has comparatively high property tax but no state income tax.