The lender actually said he will only underwrite my property as a single renter long term rental based on comps. 

When you find out the present zoning of the property, the future land use and the local agencies comprehensive plan for how they see the area being developed (all can be done at the local planning office) you will have a much better idea of what you have just bought.If the land could in any way be developed into something more than single family residential lots, i.e. if there is any multi-family or commercial component than I would advise you to hire someone qualified to help you with the site planning of the development.

Go to Etsy and search for "rental property tracker," and you will find hundreds of nice spreadsheets to track 10-20 rentals, usually for under $10.Software has extremely helpful features like online payments, marketing syndication (click a button, and your property is advertised on multiple sites), electronic document review/signing, maintenance tracking, and owner reports.

Unfortunately, North Jersey is probably one of the hardest BRRRR markets in the country right now because of extremely low inventory, high demand, and pushed up prices because single-family home buyers are buying the properties that we all used to buy to fix up because they are desperate.You can BRRRR, carefully, into many parts of Pennsylvania though but remember that interest rates right now make it very hard to BRRRR.

@Eugene BrownTo expand your property portfolio, leverage equity or savings, explore multi-unit and single-family properties, and consider the BRRRR Strategy.

Purchase price: $502,000 Cash invested: $100,400 Purchased this single family home located about 1.5 miles from Downtown Houston.

I wait well over a month before I hear any responses and then every single time they ask me to drop the rent.

You can exchange 1 property into multiple properties in locations and any asset class (farm, office, single family, multifamily). 

I'd recommend looking for either single-family homes or multi-family properties with 2-4 units.

If entities are disregarded, you can keep up with more than 1 in a single QBO account using the location/business feature to keep track of them separately.