It's not rocket science, there is a simple cause.

I actually changed the filter one day went back after 7 days and checked it and it has MUCH MORE dirt and hair on it then a three month old filter in the other no pet apartment.Also, are the modern day units engineered differently? 

I'm a bit of a building-science nerd.

Freshly finished wood floors, beatuiful cabinets and fixtures (all from auction) and modern paint (taupes and an accent wall).

Just curious about how to judge them as there's no easy to view rating system for them.Yeah, appraising is an art, not a science.

A VERY nicely kept up house and modernized!  

The one thing most everyone said in one way or another is fear of the unknown.Here are a couple of tips:1) Real estate isn't rocket science.

But if you are doing a modern farmhouse vibe you may want a two panel. 

This house from 1888 was tempting based on it's age and the amount of original pieces that existed, along with the potential to modernize it.

Basic maintenance requests completed within 5 days, emergency maintenance requests completed within 2 days, preventative maintenance work twice a year, tenant-caused maintenance billed back to tenant, periodic inspections to make sure that the tenant is reporting necessary maintenance items, late fees collected, immediate 30 day notices posted, pet fees monitored and collected, move in inspections, move out inspections, move out damages charged to tenant, advanced notice on capital repair items, 30 day move out notices communicated, pre-leasing of property, tenant stay incentives, gutters cleaned, annual rent rate analysis, turns completed in 30 days, background checks on all occupants over 18, prior landlord references, co-signers on leases, direct deposit funds, monthly summary statements, online vacancy postings, post-eviction collections...So, I trade in managing my buildings, which I have down to a science, to managing a property manager?