They are expecting a rent increase.They offered to replace the stack washer set at their expense and leave it at end of their occupancy in exchange for s 5 year lease.This is just before the current crisis hit really hard.

The 1031 exchange is a process where you sell your old property and using a specific process purchase a replacement property or properties. 

When replacing that kitchen faucet, it doesn't matter if you buy the $700 one or the $50 one.

Usually the further south the water table and restrictive layer drops to a point you can accomodate trench systems and avoid expensive fill and grading unless your soil is ledgy or really sucks.I do wonder why you can't use a grandfather clause and do an in kind system to replace your existing system. 

In my area it is $6 sf to replace. 3000 sf * $6 sf= $18000/ 10 year life span, 12 months in a year = $150 per month for 1 item.

I replaced everything in the house to make this 1940s house look brand new.

I need to update the outside, new paint, replace some wood rot, etc. as a first priority. 

The roofer said they never reinstalled the skylight surroundings during roof replacement and new installation.

There house is in poor shape and I've been suggesting that they consider repurposing the land to replace their home with a few multifamily units. 

You might say you can do things like change a faucet, change a toilet, replace a P trap, etc.