That said, they're more expensive, have fewer buyers (though the market around here has been very active for that property class), so if you decide being a landlord isn't for you you may face a longer time to sell.Also, with larger properties you get into efficiencies of scale, where by having more tenants, maintenance issues, etc, centrally located, you're able to deal with those problems with less travel time and operating costs because you/your handyman can do multiple repairs without having to drive between multiple properties. 

However, possible real world positive implications would be using your wife's name/income to qualify for some of your mortgages increasing the number you can have, or boost your buying power on a mortgage you both cosign.

I just don't want it to hurt my purchasing power.

That isn't a way to run an efficient business for the agent to make money.

A new high efficiency boiler isn't a bad investment either.

I would like to know how to work them efficiently. 

Hi BP,As I start to acquire more and more properties, the efficiency of my records of expenses/income/ROI is getting complicated and honestly not as organized as I would like.  

Either way in that situation you make your goal.I had a lender one time tell me they underwrite 50% opex regardless of sellers numbers because if they take it back from the borrower because of default they will not be managing themselves and they also could not run it as efficiently as the previous owner who sold it to their borrower.Underwrite conservatively for standard industry practices.I don't buy anything on the if the (everything goes right) scenario because if it doesn't you are up the creek.   

Likewise, their tenant selection process and maintenance operations directly impact the investor's returns and their own performance metrics, so they are incentivized to find the best tenants and handle issues efficiently.

Does anyone have any advice on such a company, that they have used before and was very efficient and trustworthy?