I'm looking to better understand the different laws and technicalities involved in owning a long distance rental south of the border.

General Question: If I have two properties to choose between 4 BHK Single Story (1650 Sq Feet) inn Leander (Border of Cedar Park) vs 4 BHK Double Story (2100 Sq Feet) in Leander with 5 miles of radius of zip code.

In my opinion, based on basic numbers displayed it's not a good deal unless you start cash flowing on 13th month.

If i bordered the slab with pavers it might be a bit cheaper. 

Southern Wisconsin hovering the Illinois Border as well.

That's border line a violation of your agency to them and definitely walks a fine line of ethics. 

Tenant in a SFR should also be responsible for lawn care and snow removal.I don't think that Zestimates are worth the electrons used to display them on your computer monitor.

2 rentals on a college campus in Eastern PA near the NJ/NY border.

If this is the case your project is completely shut down until the emergency orders are lifted.If labor for your project is coming from nearby states that have a stay-at-home order this may affect them2.Material shortage: In my area of Maryland a lot of construction owners and projects purchase materials from Pennsylvania which is currently under a stay-at-home border.

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