As a property manager for a few years now I can say that:1) it's incredibly rewarding and one of the best feelings is to take a problem property with problem tenants and turn them around and make them into a profitable venture (I've been doing that for a decade with foreclosures so it's much the same to do it for investors).2) I have fired clients over the years...when my office is disrupted and angry emails and calls are coming in OR when I have come to the conclusion that an owner doesn't feel we are worth the value (and in turn we don't feel they are worth the effort to calm down and constantly smooth feathers) then we respectfully part ways. 

I'm sure you can hear the train, but not to the extent that it would become disruptive if you were hanging out in the yard.

AND you'd have no right really to go in there and disrupt the tenant's lives to improve the units so you could get higher rents or sell the property for a premium.

A second mortgage, however, should not prevent or disrupt the sale.

  $15-20 per hour is standard which might be a bit high given the ease of the tasks but you need to take into account the fact that they are driving out and disrupting their life for what is often a 10=30 min task. 

Appraiser and electrician were came out the same day, back to back appointments to minimize disruption to the tenant.

its common in multi family in SFR though its not uncommon to have a home inspection once your in contract and finacing is approved. you want to limit your tenants disruptions.. because there is also going to be an appraisal if your financing.. we try to  do appraisal and inspection same day when ever possible.

Local Legislation, tenant pool quality, tax legislation, natural disasters, job market growth, saturation of real inventory, and real estate market disruptions through innovation are a few of the things that you cannot control.

But to your point i need to button up my lease to see what language covers disruptions to otber tenants and point to that as recourse.

The flow of the house is disrupted in that the garage is a long haul to the bathroom.