But the places we all encounter that could only have a wheelchair ramp put in that intrudes into the public sidewalk (which neither the landlord nor the tenant owns, and now the sidewalk may not be sufficiently wide or accessible for a wheelchair), or that would require tearing down the storefront's façade (envision a storefront right up against the sidewalk), are grandfathered in. 

Sounds like great prices but 9 repairs in 12 months called in by tenant, it seems to have finally stabilized after owning for 18 months (no repair calls in 3 months so far), stolen AC unit, attempted break in on other house (alarm scared intruder away).

I have 3 big barking dogs (but one is very old) including one (great Pyrenees ) that bites intruders but they are behind a fence and packages are left on the other side of the fence.  

If the remediation devices intrude significantly into the livable space, that will probably detract from value. 

You can if you want a truly ADA unit.Option 2) There are ADA design elements that are easily implemented, low cost and don't really intrude for a non disabled tenant.

I plan to put up a solar camera on the front end of the garage.It should be fully disclosed, there should be a specific purpose for it, and it shouldn't intrude on anyone's privacy.Example: "I have experienced several break-ins over the last two years.

Too many headaches for cash flow on paper (which is actually negative in reality) : stolen AC unit (thieves climbed a 7 ft fence), attempted break in (alarm scared intruder away), repair issues, winter weather (make sure someone turns up the heat on a vacant property).

I have 2 homes on the Eastside - AC unit was stolen before tenant moved in (thieves climbed a 7 foot fence), attempted break in with the other house (alarm scared intruder away). 

Same wall has an exterior defect that allows water to intrude through stucco from below due to no weep screet and soaks the base wood frame.

I mean say if I include in the lease contract something that says "any rent later then the 1st of month shall be considered violation of this lease and this yearly lease shall simply become a weekly lease (as weekly leases I read only need 3 days notice to evict) from when a 3 days notice is automatically needed to be considered with per day penalty being $100 if not moved within 3 days of non repayment of rent from the date of not paying (due date) the person's presence on the property shall be considered illegal and will be treated no less then a violent intruder".