Run down the list of each estimate 1)blown control boardl, 2)a cracked heat exchager, 3)bad control valve, and brushes failed in blower motor. 

IF I WERE YOU I WOULD BRUSH UP ON FAIR HOUSING LAWS.

You can use a brush, but you really need a HPLV detail sprayer.

Yes we should all clean the lint screen in the drier however you still need to buy a cheap chimney brush and clean out the flu at least once a year.

Make it like brushing your teeth.

(sarcasm) :)We have 5 (FIVE)...........yes five.The key difference is NOT the cats but the owners who take care of them.Many owners do not properly care for their animals.Our cats have always been indoor cats. 2 were strays but were kittens when found.All our cats are domesticated an dhave been tested and cleared.They are spayed and neutered.They never go outside except for our porch on the balcony upstairs for a few minutes then they want to go back in.Having animals is expensive to take care of properly.You have to make sure they have regular vet visits to keep them healthy.Every 3 weeks we clip their nails,clean their ears,and comb them.We brush their teeth a few times a week and bath them occasionally.The only reason a cat will go outside of the litter box is if:1.they cannot access it2.The owners don't clean it enough (how would you like standing in crap to go to the bathroom).3.The owners have too few litter boxes for the number of cats4.The owners let sick cats or outside cats mingle with their inside ones which can lead to many diseases including feline leukemia.I would say in fairness to landlords as pet owners who own our house we are probably in the top 30% of pet owners as far as caring for them.The cats if you clip them every 3 weeks will not do damage to the carpets as the claws will not be sharp enough.Also if you have scratch pads they can that will help immensely.Pets cared for properly have shown to reduce stress,prevent strokes,and lower blood pressure for better heart health.As a landlord you would have to consider many pet owners would fall into the negligence category sadly.For this you have to take on bigger deposits to mitigate the risk.

Just brush twice a day and make an appointment to see me in 6 months.You'll be far ahead of the game if you simply use your time to seek out a good mortgage broker originator, IMO.

Do we have to wait three years to make any changes to the property to include any removing of brush, cutting down trees, or building a home or anything on the lot?

We keep things clean, but sure don't scrub the floor UNDER the baseboard radiators with a toothbrush-sized brush, like she did.

Anyone, in my opinion, that didn't see the issues that @Walt Payne brought up either brushed through it quickly or read it with blinders on.