And with increased size of the property it takes longer to find a tenant.

Let's give him the benefit of the doubt and assume a 45% expense ratio (still very low for properties this size).

Make sure you have the baseline of amenities for your cabin size -- hot tub, arcade game, pool table, etc. 

Gourmet kitchen w/granite and SS appliances, Built ins, Rooftop terrace w/double sided fireplace to enjoy Fabulous water views of the Potomac River ,Wet bar wine fridge and dishwasher on Rooftop level with over sized bedroom and full bath.

In reality, they are at the garden level and the two floors above.The garden unit is only about 2 feet below grade and is otherwise a regular unit... full size windows in every room, high ceiling, front and back door, separate utilities and ventilation.

Depending on what size of deal you are looking at you can always buy a spread sheet.

@Lance NeighborsThe market for multifamily properties is competitive across the board -  all sizes and price ranges.

There is a good sized Baltimore crowd on here with a lot of people from a lot of backgrounds.

You may also be able to demand bill (can't remember the exact term) based on size of the units, i.e. one unit that has 60% of the SF pays 60% of the bill.

What is the size of your location 25/50/100/200/400/etc.